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[DOC File]Instructional Unit: Properties of Circles
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Using the Circle Area worksheet as a guide, students will work individually or in pairs to develop a general formula for finding the area of a circumscribed polygon in terms of the radius of the circle and the number of sides of the regular polygon.
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[DOC File]Comparing and Contrasting Area and Circumference of Circles
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Area of a circle = πr2 Circumference of a circle = 2πr. Teacher Key: The area function is quadratic. It forms a parabola. This is because the formula for area is increasing exponentially. Yes, approximately (2, 12.7). This point represents when the area and circumference are equal and both having a radius of 2 …
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[DOC File]Pre-Assessment for Area
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Discuss what is involved in the formula for finding area of a circle. Instruction (20 min) Define radius – distance from the center to any point on the circle. Define diameter – distance across the circle through the center. Define circle – set of points in a plane that are the same distance from a given point.
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[DOC File]Geometry 2-B
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23. Find the approximate circumference of a circle with . diameter = 10cm 24. Find the approximate circumference of a circle with . radius = 5cm 25. Find the exact circumference of a circle with . radius = 3cm. 26. Find the exact circumference of a circle with . diameter = 12cm. 27. State the . FORMULA. for finding ARC LENGTH: Use the formula ...
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[DOC File]Lesson #1: Area of Circles
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The formula to find the area of a . The diameter of a circle is 2 times the radius. Find the area of the circle. r = 5 in. Substitute into the area formula. . 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.
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In the previous chapters we have explored a variety of ...
In addition to arclength, we can also use angles to find the area of a sector of a circle. A sector is a portion of a circle contained between two lines from the center, like a slice of pizza or pie. Recall that the area of a circle with radius r can be found using the formula .
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[DOC File]Unit 4: Circles and Area
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1. Find the area of each circle. Round answers to the nearest tenth…one decimal place. a). Area = π × r × r. 5 cm b). diameter = Area = π × r × r. 8.4 m radius = 2. The diameter of a dime is 1.8 cm. Find the area of the dime. diameter = Area = π × r × r. radius =
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[DOC File]Geometry – Shapes
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Area. Radius. Diameter. Circumference. Using the formula πr2, given that the radius of the circle is 10 feet, what is the measurement of the circumference? (π = 3.14) 31.4 ft. 314 ft. 156 ft. 62.8 ft. What kind of shape is formed by the planter in the NE corner? Hexagon. Octagon. Parallelogram. Quadrilateral. What kind of shape is formed by ...
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[DOC File]Name: _____________________________________________ Period
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AREA Formula CIRCUMFERENCE (Perimeter) Formula Circle A = r. C = d or C = 2r POLYGON AREA Formula 1 AREA Formula 2 Square A = s. A = ½ d Rhombus A = bh. A = ½ dd Parallelogram ... The circumference of a circle is 208π. Find the diameter. 4. The perimeter of a rectangle is 165 ft. The height of the rectangle is 39 ft. Find the length of the ...
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Area of a circle using diameter formula