ࡱ> jb jbjb > qTcTcTc8cHdhezf"fffjkDk$,6R~/ljj"ll/*nff"D*n*n*nlf^f*nl*n*nz@\e u hTcl~jZ0C*n*nZTcTcLesson #1: Area of Circles Objective: Students will be able to find area of circles. Notes and Explanation: The area measurement of a figure refers to the number of square units needed to cover the surface of the figure. Some of the many real world applications for finding the area of figures include household projects, construction work, sewing, and mowing the lawn. If you were going to tile a room that is 50 square feet you would need 50 tiles that are 1 square foot each (even if the shape is round). Remember: Units for area are always squared. Examples: ft2, in.2, m2 etc The formula to find the area of a  EMBED Equation.DSMT4  The diameter of a circle is 2 times the radius.  EMBED Equation.DSMT4  Find the area of the circle. r = 5 in. Substitute into the area formula.  EMBED Equation.DSMT4 .  EMBED Equation.DSMT4   EMBED Equation.DSMT4  Example 1: Solve for the area of a circle with a radius equal to 4 meters. (1) Area = 3.14 x (4 x 4) Apply the amounts given in the problem to the formula. (2) Area = 3.14 x 16 Multiply the numbers within the parentheses. (3) Area = 50.24 Perform calculations to find the answer. A semicircle is half of a circle. The area of a semicircle is exactly half of the area of a circle with the same radius. Example 2: What is the area of the following semicircle? Round your answer to the nearest hundredth.   1. The diameter of the semicircle is 13 inches, so the radius is 13 inches divided by 2 (6.5 inches). 2. Determine the area of a circle with radius 6.5 inches. 3. Divide the area of the circle by 2 to find the area of the semicircle with radius 6.5 in. 4. Round 66.3325 to the nearest hundredth. The area of the semicircle is 66.33 square inches. Evaluation: 1. What is the area of a circle with a diameter of 100 feet? A. 314 square feet B. 31,400 square feet C. 7,850 square feet D. 628 square feet 2. What is the area of a circle with a diameter of 9.2 centimeters? Round your answer to the nearest hundredth. A. 66.44 square centimeters B. 265.77 square centimeters C. 28.89 square centimeters D. 21.16 square centimeters 3. What is the area of the circle? Round your answer to the nearest hundredth.  A. 69.71 square meters B. 1,547.52 square meters C. 386.88 square meters D. 34.85 square meters Answers: 1. C 2. A 3. C Lesson #2: Area of Polygons Objective: Students will be able to find area of plane figures such as polygons, circles and other figures. Notes and Explanation: There many polygons and shapes that may require formulas to calculate. Use the following list of formulas to study area for a variety of polygons. Resources to find area formulas:  HYPERLINK "http://mathforum.org/paths/measurement/h.drmath.area.html" http://mathforum.org/paths/measurement/h.drmath.area.html  HYPERLINK "http://www.math.com/school/subject3/lessons/S3U2L4GL.html" http://www.math.com/school/subject3/lessons/S3U2L4GL.html The area measurement of a figure refers to the number of square units needed to cover the surface of the figure. Some of the many real world applications for finding the area of figures include household projects, construction work, sewing, and mowing the lawn. If you were going to tile a room that is 50 square feet you would need 50 tiles that are 1 square foot each. Remember: Units for area are always squared. Examples: ft2 , in.2 , m2 etc The formula for calculating the area of a square or rectangle is: Area = length x width. Example 1: A figure has a width of 3 inches and a length of 7 inches. What is the area of the figure?  Step 1: Multiply the width and the length. Area = 7 x 3 = 21 Answer: 21 square inches Example 2: What is the value of x?   1. The area of a rectangle can be found using the following formula: Area = length x width. The area and width are known, so substitute them into the formula for area. 2. Divide each side of the equation by 20m to isolate the x on one side of the equal sign. 3. 500 divided by 20 equals 25. Answer: x = 25 m It may be useful to use graph paper to develop figures. Help the student determine the area of various figures drawn on the graph paper. The formula for the area of a triangle is:  Example 1: What is the area of a triangle if its base is 13 ft and its height is 10 ft?   1. Write the formula for the area of a triangle. 2. Substitute 13 ft for the base and 10 ft for the height in the formula. 3. Find the product of 13 ft and 10 ft.0 4. Multiply 130 by 1/2 (or divide 130 by 2). Answer: 65 ft2 Example 2: The side of a hay storage building is in the shape of a triangle. What is the area of the side of the building if its base is 10 ft, its height is 12 ft, and the lengths of the other two sides are 13 ft?   1. Write the formula for the area of a triangle. As you can see from the formula, the lengths of the other two sides, besides the base, are not needed to calculate the area. 2. Substitute 10 ft for the base and 12 ft for the height in the formula. 3. Find the product of 10 ft and 12 ft. 4. Multiply 120 by 1/2. Answer: 60 ft2 Area of Parallelogram A parallelogram is a quadrilateral (a four-sided figure) with two pairs of parallel and congruent sides. Area is the measure, in square units, of the interior region of a two-dimensional figure. To find the area of a parallelogram, multiply the base(b) by the height(h). The base is the length of either the top or bottom. The height is the length of a line going from the base at a right angle to the opposite side. Here is the formula:  Area of a parallelogram = (base) x (height) Example 1: Find the area of a parallelogram with a base equal to 5 feet and a height equal to 2 feet?  Area = 5 feet x 2 feet = 10 square feet Answer: 10 square feet Example Josh has a job to tile a room 16 ft x 18 ft with 1 ft. square tiles. How many tiles does he need? A) 18 tiles B) 16 tiles C) 288 tiles. D) 144 tiles Answer: B Evaluation: 1. Josh has a job to tile a room 18 ft x 20 ft with 1 ft. square tiles. How many tiles does he need? A. 18 tiles 38 tiles 360 tiles 180 tiles 2. Nina built a model parallelogram with a height of 14.9 inches and a base of 45.9 inches. What is the area of Nina's parallelogram? A. 60.8 square inches B. 683.91 square inches C. 68.391 square inches D. 608 square inches 3. What is the area of a parallelogram with a base equal to 11 inches and a height equal to 1.1 inches? A. 12.1 square inches B. 1.21 square inches C. 12 square inches D. 0.121 square inches 4. One of the triangular-shaped sails on a tall-masted sailing ship is 35 ft long and 22 ft high. How many square feet of cloth were used to make the sail?  A. 385 ft2 B. 770 ft2 C. 193 ft2 D. 1,540 ft2 Answers: 1. C 2. B 3. A 4. A Helpful hints to parents: It may be useful to use graph paper to develop figures. Help the student determine the area of various figures drawn on the graph paper. Formulas and diagrams    EMBED Word.Picture.8      EMBED Word.Picture.8  Lesson #3: Classifying Triangles Objective: Students will be able to classify triangles by angles and sides. Notes and Explanation: Classifying Triangles Triangles can be classified using their side lengths and angle measures, as shown in the diagrams below.  An obtuse triangle contains one obtuse angle. An obtuse angle is any angle greater than 90 . Because the sum of the angles in a triangle is equal to 180 , there is never more than one obtuse angle in a triangle. An acute triangle contains three acute angles. An acute angle is any angle less than 90. An equiangular triangle contains three angles with the same measure. That is, all of the angles are 60. An equiangular triangle is also an acute triangle. A right triangle contains one right angle. Right angles measure 90. Because the sum of the angles in a triangle is equal to 180, there is never more than one right angle in a triangle.  A scalene triangle contains three sides of different lengths. An isosceles triangle contains two sides of the same length. All isosceles triangles also have two equal angles. An equilateral triangle contains three sides of the same length. All equilateral triangles are also equiangular. Example 1: Classify the following triangle.  Solution: The triangle has three sides of equal length, and therefore it is an equilateral triangle. All equilateral triangles have angle measures of 60, 60, and 60. Therefore, this triangle can also be classified as equiangular or acute. Answer: The triangle is equilateral, equiangular, and acute. Example 2: Classify the following triangle.  Solution: The triangle contains a 90 angle, and therefore it is a right triangle. The remaining two angles are equivalent so the triangle is an isosceles triangle as well. Answer: The triangle is a right isosceles triangle. Activity: Measure the sides of the following triangles. Label the lengths. Classify the triangles according to the measurements of their sides.  2.  Classify the triangle by their angles 3.   Evaluation: 1. Classify the following triangle.  A. right B. isosceles C. obtuse D. acute 2. Classify the following triangle.  A. obtuse scalene B. obtuse isosceles C. acute scalene D. acute isosceles 3. Classify the following triangle.  A. isosceles B. equilateral C. scalene D. obtuse Answers: D 2. B 3. C Lesson #4: Identifying Geometric Figures Objective: Students will identify lines, angles, circles, polygons, cylinders, cones, rectangular solids, and spheres in everyday life. Notes and Explanation: The following chart identifies various geometric shapes. Students should be able to recognize these shapes in their everyday environment.  Students should also be able to identify the following solid figures: Cylinder - a solid with two bases that are congruent circles  Sphere - a solid with all points at a fixed distance from the center  Cone - a solid with one circular face and one vertex  Pyramid - a solid with one face that is a polygon and three (or more) faces that are triangles with a common vertex  Cube - a rectangular prism with six congruent square faces  Triangular prism - a prism with two parallel faces that are congruent triangles and three additional faces that are parallelograms  Octagon - a polygon with eight (8) sides Materials: Items in your home. Look in the kitchen or pantry. Activity: List and Identify house hold items and what geometric shape they are: 1. Can of soup cylinder. 2. Box of Cereal - 3. Sheet of paper 4. 5. Evaluation: 1. What is the name of the figure?  A. cylinder B. sphere C. cone D. triangular prism 2. What is the name of this figure?  A. triangular prism B. triangular pyramid C. cone D. rectangular pyramid 3. A square pyramid has 5 faces. How many vertices does it have? A. 4 vertices B. 10 vertices C. 8 vertices D. 5 vertices Answers: 1. C 2. A 3. D Lesson #5: Perimeter and Circumference Objective: Students will be able to find the perimeter and circumference of plane figures such as polygons, circles and other figures. Notes and Explanation: Perimeter is the measurement of the distance around a figure. To calculate the perimeter of a figure, add the lengths of all the sides of the figure. Example 1: What is the perimeter of a figure that has four sides measuring 3 inches, 7 inches, 3 inches and 7 inches? Remember the units must be the same when you add the lengths together. For example: if you have feet and inches you must to convert the feet to inches.  P = 7 + 3 + 7 + 3 = 20 Answer: 20 inches Example 2: What is the perimeter of the figure?  Add the lengths of each side together. P = 8cm + 3cm + 4cm +6cm +7cm P = 28 cm Circumference is the distance around a circle.  C represents the circumference. r represents the radius of the circle which is the distance from the center of the circle to the edge of the circle. d represents the diameter of the circle which is the distance across the circle that also goes through the center of the circle. The diameter is two times the radius or 2r = d. Since the diameter and radius are related there are two formulas for Circumference. To find the circumference of a circle us the following formula:  EMBED Equation.DSMT4  Example 3: Find the circumference of the circle. Use  EMBED Equation.DSMT4   Use the formula that used the diameter and substitute the values.  EMBED Equation.DSMT4  Practice: Answer the following questions: Use  EMBED Equation.DSMT4  if necessary. 1. What is the circumference of the circle? Round your answer to the nearest hundredth.  A. 34.54 cm B. 379.94 cm C. 69.08 cm D. 484 cm 2. What is the circumference of a circle with a diameter equal to 4 centimeters? A. 16 cm B. 1.27 cm C. 0.785 cm D. 12.56 cm 3. What is the perimeter of the figure?  A. 505.74 ft B. 141.1 ft C. 70.55 ft D. 123.15 ft 4. What is the perimeter of the figure?  A. 67.46 meters B. 202.38 meters C. 101.19 meters D. 404.76 meters Evaluation: Answer the following questions. Use  EMBED Equation.DSMT4  if necessary 1. The circumference of a circle is 26.376 meters. What is the diameter of the circle? A. 8.4 m B. 82.82 m C. 3.14 m D. 0.12 m 2. What is the perimeter of a rectangle with a width equal to 45 feet and a length twice as long as the width? A. 270 feet B. 180 feet C. 135 feet D. 2025 feet 3. What is the circumference of the circle? Round your answer to the nearest hundredth.  A. 31.4 cm B. 78.5 cm C. 62.80 cm D. 3.14 cm Answers Activity: 1. C 2. D 3. D 4. B Evaluation: 1. A 2. A 3. A Helpful hints to parents: 1. In some problems students may be given the circumference and have to find the diameter or the radius of a circle. The student should substitute the given values into the formula and solve the equation for the unknown value. 2. Encourage the student to draw a diagram for each problem. Label the diagram with all information provided and then use any formulas provided to help answer the question. Lesson #6: Pythagorean Theorem Objective: Students will use the Pythagorean theorem to solve problems. The Pythagorean Theorem allows us to determine the lengths of sides of a right triangle. (A right triangle is a triangle with a 90 angle). The Pythagorean Theorem states that the square of the hypotenuse (the longest side, and side opposite the 90 angle) of a right triangle is equal to the sum of the squares of the legs (the two shorter sides) of that triangle. The formula in written form is:  where a and b are the short sides (called legs ) and c is the long side (the hypotenuse). Example 1: The lengths of two legs of a right triangle are 4 and 3. What is the length of the hypotenuse c?   1. a = 4 and b = 3. Substitute these values into the Pythagorean Theorem. 2. Evaluate the values of the square terms 4 x 4 = 16 and 3 x 3 = 9. 3. Add 16 and 9 to get 25. 4. Take the square root of both sides of the equation to isolate the variable c. 5. We only need the positive value of the square root because we are talking about a distance. The hypotenuse of the triangle is 5. Materials: Ruler and some rectangles such as a book, a piece of paper or a table top. Activity: Find some rectangles at home. Measure the length and width. Use the Pythagorean Theorem to calculate the hypotenuse of the triangle the length and width make make. Check your work by measuring the diagonal (hypotenuse). Evaluation: 1. What is the value of x? (hint use a calculator to estimate  EMBED Equation.DSMT4   A.  B.  C.  D.  2. What is the area of the right triangle?  A. 6 square centimeters B. 7.5 square centimeters C. 10 square centimeters D. 15 square centimeters 3. Michele's basketball court is fifty feet wide and one hundred feet long. Michele and her friend Meredith want to play a new game on Michele's basketball court, but first they must draw a diagonal line from two opposite corners of the basketball court and measure the length of the diagonal line. Approximately how many feet will the diagonal line be? A. 150 feet B. 112 feet C. 75 feet D. 39 feet Answers: 1. B 2. A 3. B Helpful hints to parents: Pythagorean Theorem The Pythagorean Theorem is used to find the lengths of the sides and hypotenuse of a right triangle. The Pythagorean Theorem states that the square of the hypotenuse (the longest side) of a right triangle (a triangle with one 90 degree angle) is equal to the sum of the squares of the legs of that triangle (the two shorter sides).   Looking at the diagram above, we can note that a and b always denote legs of a right triangle and c always denotes the hypotenuse of a right triangle. Lesson #7: Similar and Congruent Figures Objective: Identifies and differentiates between similar and congruent figures. Uses proportion to find missing lengths of sides of similar figures and to enlarge figures. Notes and Explanation: Similar figures are figures that have the same shape, but not necessarily the same size. Congruent figures are figures that have the same shape and the same size. Imagine that you have reduced or enlarged a figure in a photocopy machine - the figure has the same shape, but not the same size. In similar figures: corresponding angles are congruent (or equal) corresponding sides are proportional Similar triangles have the same angles, but the length of the sides are shorter or longer. However, the length of the sides must be proportional. This means that if one of the sides is twice as long as the corresponding side of the other triangle, then all the sides must be twice as long as the corresponding sides of the other triangle. Example 1: If we have a triangle with side lengths of 2, 3, and 4 and a larger similar triangle with the shortest side equal to 6, what is the length of the other two sides of the triangle?  Solution: First, draw the figures so you can visualize the problem. Since the shortest side of the first triangle is 2, we know that 2 x 3 is 6, so the other sides are 3 times the sides of the first triangle. The other two sides are 9 and 12 (3 x 3 = 9 and 4 x 3 = 12). We can also solve these types of problems using proportions. Example 2: A rectangle has width equal to 10 feet and length equal to 16 feet. A similar rectangle has length equal to 22 feet. What is its width of the second rectangle? First, draw the figures so you can visualize the problem.   1. Set up the proportion to solve for y. 2. Cross multiply. 3. Divide each side of the equation by 16. Answer: 13.75 feet In congruent figures: corresponding angles are congruent (or equal) corresponding sides are congruent or have the same measure Similar polygons are polygons in which the corresponding angles have the same measure and the ratios of the corresponding sides are the same (or the corresponding sides are proportional). All circles are similar because they have the same shape, but can differ in size depending upon the length of the radii. The following examples show pairs of similar figures.  Note that in the triangle example, the ratio of the lengths of the altitudes is shown to have the same ratio as that of the corresponding sides. (An altitude of a triangle is a segment drawn from the vertex of a triangle such that it forms a 90?? angle with the opposite side.) 1. The following figures are similar. What is the value of x?  A. x = 55.3 B. x = 18.3 C. x = 74 D. x = 46 2. A rectangle has length equal to 12.2 and width equal to 4.19. A similar rectangle has width equal to 25.14. What is the length of the similar rectangle? A. x = 73.20 B. x = 37.34 C. x = 29.33 D. x = 41.53 Answers: 1. C 2. A Evaluation: 1. Fill in the blank. Similar figures have _____________. A. different sizes and shapes B. the same size, but a different shape C. the same size and shape D. different sizes, but the same shape 2. The following trapezoids are similar. What is the value of X?  A. 32 m B. 2 m C. 48 m D. 8 m 3. These two figures are similar. What is the value of x?  A. 12 m B. 6.75 m C. 19 m D. 21.3 m Answers: 1. D 2. D 3. B Helpful hints to parents: Polygons A polygon is a closed shape formed by three or more sides. For example, a triangle is a polygon with three sides and a quadrilateral is a polygon with four sides. It may be helpful to verify that the student is familiar with different polygons commonly taught in this grade. The following is a list of polygons and definitions.  It may also be helpful to review some basic facts of parallelograms. squares, rectangles, and rhombuses are special types of parallelograms consecutive angles of parallelograms are supplementary (add up to 180 ) opposite angles of parallelograms are congruent the diagonals of a parallelogram bisect each other; the diagonals of a rhombus are also perpendicular Use the figure below for examples 1, 2, and 3. Transformation A transformation moves every point of a geometric figure to a new position in the coordinate plane. It may be beneficial to develop a coordinate plane with graph paper. Cut out a figure, such as a parallelogram, and plot it on the graph. Move (transform) the parallelogram to another area and plot those points. For example, a figure with coordinate points (1, 3), (5, 1), (4, 8), (2, 2) can be moved 5 places to the right to have coordinate points of (6, 3), (10, 1), (9, 8), (7, 2). Help the student plot all of these points to show him or her how the figure transforms. A reflection is a transformation in which a figure is flipped over a line. Each point in the reflection is the same distance from the line as the original point. Example 1: The x-axis is the line of symmetry for figure ABCD. What is the reflection point of point B?  Answer: (-2, 2). Point B is represented by the coordinates (-2, -2). Point B is 2 units from the x-axis (the line of symmetry). The figure will be reflected across the x-axis. The reflection point of point B will be 2 units above the x-axis at (-2, 2). A rotation involves rotating a figure around a point called the point of rotation. Example 2: What will the coordinates of point B be if the figure ABCD is rotated around point Y so that point A is at (4, -1)?  Answer: (4, -3). Since figure ABCD is a square (each side is 2 units), when point A is rotated to the position of point B, then point B will be rotated to the position of point C. Lesson #8: Surface Area Objective: Student will find surface area of simple solid figures such as rectangular prisms, cylinders, Notes and Explanation: The surface area of a solid figure is the sum of the areas of all the surfaces. A prism is a polyhedron with parallel bases that are congruent polygons. The other faces of the prism are parallelograms. To find the surface area of a prism, the student must first find the area of each face. The following is an example of a figure that has six faces.   Step 1: Find the area of the six faces: Area of front = 15 square meters Area of back = 15 square meters Area of top = 6 square meters Area of bottom = 6 square meters Area of side = 10 square meters Area of side = 10 square meters Step 2: Add the areas of the six faces: 15 + 15 + 6 + 6 + 10 + 10 = 62 Answer: 62 square meters The surface area of a solid figure is the sum of the areas of all the surfaces. A cylinder is a solid figure with two bases that are circles. A face is one side of a solid figure. When trying to find the surface area of a figure, first find the area of each face, then add those areas together. Example: Find the surface area of the figure.   Every cylinder has 3 faces: two circles and one rectangle. One way to illustrate this is to roll a rectangular piece of paper into a tube. Each end of the tube is a circle and the tube itself is a rectangle. The top and bottom of the cylinder look like ovals when they are drawn, but they are actually circles. Draw the three faces of the cylinder and label the known parts. The length of the rectangle is not known. It can be found by determining the circumference of the circles. (Circumference is the distance around the circle.) The length of the rectangle is  Determine the area of each face of the cylinder Find the sum of the three faces of the cylinder. The surface area of the cylinder is 904.32 square inches. Materials: Cereal box or a shoe box and a ruler Activity: Find the surface area of a box. Measure the length, width and height of your box. Follow the example for rectangular prism. Add the area of all the faces of the box. Evaluation: 1. A rectangular prism has a length of 100 cm, a height of 10 cm and a width of 5 cm. What is the surface area of the rectangular prism? A. 3100 square centimeters B. 1550 square centimeters C. 5000 square centimeters D. 1200 square centimeters 2. What is the surface area of the figure?  A. 936 square meters B. 866 square meters C. 450 square meters D. 20280 square meters 3. A large building is 36.5 meters long, 19.5 meters wide and 25.5 meters tall. Including the bases, what is the surface area of the building? A. 2,140.25 square meters B. 3,846 square meters C. 4,718 square meters D. 4,279.5 square meters 4. What is the surface area of the figure?  A. 313.4976 square centimeters B. 156.7488 square centimeters C. 289.3824 square centimeters D. 156.7488 square centimeters 5. The water tank is in the shape of a cylinder. The diameter of the tank is 10 yards. The height of the tank is 100 yards. What is the surface area of the tank? A. 15,857 square yards B. 3,202.8 square yards C. 3,297 square yards D. 1,000 square yards Helpful hints to parents: Have students explore items in your house: such as cans, boxes, and books. Students should measure the items to determine the surface area. Answers: 1. A 2. B 3. D 4. A 5. C Lesson #9: Customary and Metric Units Objective: Apply customary or metric units of measure to determine length, area, volume/capacity, weight/mass, time and temperature. Materials: A ruler with metric and customary units, household items such as a pencil, a book, a plates, a sheet of paper, TV Remote. Units of measure help us understand the characteristic of our environment. We understand how big an item is by measuring using inches, feet, yards and miles. We understand the size of a room, a sheet of paper or a table top by the area it covers (related to squares). We understand how much something holds, like a can, a cup or jar by the volume measure in ounces, cups, quarts or gallons if it liquid or cubic measures like feet cubed the item is solid like a bale of straw or hay. Measurement units become complicated when have to consider metric measurements and customary units. Activity: Measure several household items and complete the chart with standard measurement metric measurement. Helpful hints to parents: The following shows the relationship between the Customary Units of measure: 12 inches = 1 foot 3 feet = 1 yard 36 inches = 1 yard 5280 feet = 1 mile 1760 yards = 1 mile 4 quarts = 1 gallon 2 pints = 1 quart 2 cups = 1 pint 4 cups = 1 quart 16 ounces = 1 pound The following shows the relationship between the Metric Units of length: 10 millimeters = 1 centimeter 100 millimeters = 1 decimeter 1000 millimeters = 1 meter 10 centimeters = 1 decimeter 100 centimeters = 1 meter 1000 meters = 1 kilometer 100 meters = 1 hectometer 10 meters = 1 dekameter Mass is the total amount of matter that a figure contains. Capacity is the liquid content or volume of a figure. Mass and capacity are communicated using the metric system. Mass/capacity problems require students to estimate the mass or capacity of specific amounts and to convert grams to milligrams, metric tons to grams, etc. Before the student can solve mass and capacity problems, he or she must first understand mass/capacity metric measurements. The gram is the basis of weight measurements in the metric system. Here is a basic breakdown of the metric system of weight. 1,000 milligrams (mg) = 1 gram (g) 100centigrams (cg) = 1 gram (g) 10 decigrams (dg) = 1 gram (g) 1 dekagram (dag) = 10 grams (g) 1 hectogram (hg) = 100 grams (g) 1 kilogram (kg) = 1,000 grams (g) 1 metric ton (t) = 1,000,000 grams The liter is the basis of capacity measurements in the metric system. Here is a basic breakdown of the metric system of capacity. 1,000 milliliters (ml) = 1 liter (l) 100centiliters (cl) = 1 liter (l) 10 deciliters (dl) = 1 liter (l) 1 dekaliter (dal) = 10 liters (l) 1 hectoliter (hl) = 100 liters (l) It is important that the student understands the following time conversions: 60 minutes = 1 hour 24 hours = 1 day 7 days = 1 week 52 weeks = 1 year 365 days = 1 year 1 kiloliter (kl) = 1,000 liters (l) Evaluation: 1. Which of the following is the best estimate for how much a car weighs? A. 2 kg B. 2 tons C. 2 dag D. 2 hg 2. Which of the following is the best estimate for how much a nickel weighs? A. 4.4 g B. 4.4 mg C. 4.4 kg D. 4.4 cg 3. 2 tons = ? kg A. 20 B. 0.02 C. 2000 D. 200 4. 1800 in = ? yd A. 50 B. 1,500 C. 150 D. 5 5. 3.5 ft = ? in A. 42 in B. 35 in C. 126 in D. 63 in 6. 71 mm = ? m A. 0.71 m B. 0.071 m C. 0.0071 m D. 7.1 m 7. 6 h 57 min + 4 h 24 min A. 10 hours and 21 minutes B. 11 hours and 21 minutes C. 12 hours and 21 minutes D. 9 hours and 21 minutes 8. 7 hours 53 minutes 33 seconds times 3 A. 22 hours 39 minutes 39 seconds B. 23 hours 39 minutes 39 seconds C. 22 hours 40 minutes 39 seconds D. 23 hours 40 minutes 39 seconds Answers: 1. B 2. A 3. C 4. A 5. A 6. B 7. B 8. D Lesson #10: Volume Objective: Student will find volume of simple solid figures such as rectangular prisms, cylinders. Notes and Explanation: Volume of Rectangular Prisms Volume is the measurement of a three-dimensional figure's interior space. Volume is measured in cubic units. The formula for calculating volume of a rectangular prism is: Volume = length x width x height Example 1: Find the volume of a rectangular prism with length = 6 inches, width = 4 inches, height = 2 inches.  (1) Volume = 2 x 4 x 6 (2) Volume = 48 cubic inches Step 1: Apply the amounts given in the problem to the formula. Step 2: Perform calculations to find the answer. Answer: 48 cubic inches Example 2: What is the height of the rectangular prism with volume =10 cubic meters, length = 2 meters, and width = 1 meter? (1) 10 = (2)(1)(h) (2) 10 = 2(h) (3) 5 = h 1. Substitute the known values into the formula for the volume of a rectangular prism. 2. Multiply 2 by 1 by h to get 2(h). 3. Divide both sides of the equation by 2 to get that h = 5. Answer: 5 meters Volume of Triangular Prism Volume is the measurement of a three-dimensional figure's interior space. Volume is measured in cubic units. A triangular prism has a triangular base and three lateral faces. The formula for calculating the volume of a triangular prism is:  Example 1: Find the volume of a triangular prism with the length of the triangular face equal to 5 meters and the height of the triangular face equal to 2 meters. The height of the prism is equal to 4 meters.   1. Find the area of the base (triangle). Apply the known amounts from the problem to the formula. 2. Perform calculations to find the area of the base. 3. Find the volume of the triangular prism. Apply the known amounts from the problem to the formula. 4. Perform calculations to find the answer. Volume of Cylinders Volume is the measurement of a three-dimensional figure's interior space. Volume is measured in cubic units. A cylinder is a solid with two bases that are congruent circles. The formula for calculating volume of a cylinder:  Remember, pi is approximately 3.14. The symbol for pi is Example 1: Solve for the volume of a cylinder with the radius equal to 4 meters and a cylinder height equal to 10 meters.   1. Find the area of the base (circle). Apply the known amounts from the problem to the formula. 2. Perform calculations to find the area of the base. 3. Find the volume of the prism. Apply the known amounts from the problem to the formula. 4. Perform calculations to find the answer. Answer: 502.4 cubic meters Materials: Cereal box or a shoe box and a ruler Activity: Find the volume area of a box. Measure the length, width and height of your box. Follow the example for rectangular prism. Find the volume of the box. Evaluation: 1. What is the volume of this figure?  A. 8.487976 cubic meters B. 4.243988 cubic meters C. 7.01 cubic meters D. 14.02 cubic meters 2. What is the volume of the figure? Round the answer to the nearest whole number.  A. 122 cubic meters B. 1,152 cubic meters C. 158 cubic meters D. 367 cubic meters 3. The local grocery store was built in the shape of a rectangular prism. The store is 15.5 hm wide, 25.5 hm long, and 10 hm tall. What is the volume of the grocery store? A. 3,952.5 cubic hectometers B. 7,905 cubic hectometers C. 395.25 cubic hectometers D. 51 cubic hectometers 4. What is the volume of this figure?  A. 12 cubic meters B. 64 cubic meters C. 24 cubic meters D. 32 cubic meters 5. What is the volume of this triangular prism?  A. 3,766.56 cubic meters B. 62.5 cubic meters C. 125 cubic meters D. 1,883.28 cubic meters 6. What is the volume of this triangular prism?  A. 51 cubic centimeters B. 204 cubic centimeters C. 102 cubic centimeters D. 68 cubic centimeters 7. What is the volume of a cylinder with a radius equal to 8 millimeters and height equal to 25 millimeters? A. 628 cubic millimeters B. 200 cubic millimeters C. 40,000 cubic millimeters D. 5,024 cubic millimeters 8. What is the volume of the cylinder?  A. 400 cubic centimeters B. 251.2 cubic centimeters C. 62.8 cubic centimeters D. 80 cubic centimeters 9. Freda bought a cylindrical planter for her new cactus. The planter has a diameter of 14 centimeters. The planter stands 24 centimeters high. What is the volume of Freda's planter? A. 3,692.64 cubic centimeters B. 1,055.04 cubic centimeters C. 14,770.56 cubic centimeters D. 527.52 cubic centimeters Helpful hints to parents: Practice finding volumes using items at home. When solving problems using paper and pencil, draw a diagram with the information that is given. Answers: 1. A 2. D 3. A 4. B 5. D 6. C 7. D 8. B 9. A     CCSD GHSGT Parent Guide Subject: Math Domain: Measurement & Geometry  PAGE  PAGE 54  EMBED Equation.DSMT4   EMBED Equation.DSMT4   EMBED Equation.DSMT4   EMBED Equation.DSMT4   EMBED Equation.DSMT4  )WYZ[qrBCHILOTUwx- . 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