ࡱ> [~{ @ >bjbj5*5* EW@W@Du2222fffާާާާ$H2DDD*; T_,$zR]f;22D*}"^^^D22Df*^^^Khdf* HFާ0H z$2222`fU^tY]$ڕڕRevision Topic 20: Sine and Cosine Rules and 3D Trigonometry The objectives of this unit are to: * use the sine and cosine rules to find the length of sides and angles in triangles; * to use the formula for the area of a triangles; * to solve problems involving the sine and cosine rules; * to solve problems involving trigonometry in 3 dimensions. Brief recap of Grade B and C material: Pythagoras Theorem: This theorem, which connects the lengths of the sides in right-angled triangles, states that:   EMBED Equation.DSMT4  where c is the length of the hypotenuse (i.e. the side opposite the right-angle) and a and b are the lengths of the other two sides. Note that the hypotenuse is the longest side in a right-angled triangle. Trigonometry The following formulae link the sides and angles in right-angled triangles:  EMBED Equation.DSMT4   EMBED Equation.DSMT4   EMBED Equation.DSMT4  where H is the length of the hypotenuse; O is the length of the side opposite the angle; A is the length of the side adjacent to the angle. These formulae are often remembered using the acronym SOHCAHTOA or by using mnemonics. Here is a commonly used mnemonic: Silly Old Harry Couldn't Answer His Test On Algebra When finding angles, remember that you need to use the SHIFT key. Further notes, examples and examination questions relating to Pythagoras theorem and trigonometry are contained in separate revision booklets. Sometimes you need to calculate lengths and angles in triangles which do not contain any right-angles. This is when the sine and cosine rules are useful. Labelling a triangle To use the sine and cosine rules, you need to understand the convention for labelling sides and angles in any triangle. Consider a general triangle: Triangles are named after their vertices - the above triangle is called triangle ABC. The three angles are commonly referred to as angles A, B and C. The length of the sides are given lower case letters: Side a is the side opposite angle A. It is sometimes referred to as side BC. Side b is the side opposite angle B. It is equivalently called side AC. Side c is the side opposite angle C. It is also known as side AB. A triangle doesnt have to be labelled using the letters A, B and C. For example, consider the triangle PQR below:  Sine Rule The sine rule connects the length of sides and angles in any triangle ABC:  It states that:  EMBED Equation.DSMT4 . An alternative version of the formula is often used when finding the size of angles:  EMBED Equation.DSMT4  Example: Finding the length of a side  The diagram shows triangle ABC. Calculate the length of side AB. Solution: To find the length of a side using the sine rule, follow these steps: Step 1: Label the triangle using the conventions outlined earlier. Step 2: Look to see whether any additional information can be added to the diagram (for example, can you deduce the length of any other angles?) Step 3: Substitute information from the diagram into the sine rule formula. Step 4: Delete the unnecessary part of the formula. Step 5: Rearrange and then work out the length of the required side. In our example, we begin by labelling the sides and by working out the size of the 3rd angle (using the fact that the sum of the angles in any triangle is 180.  Substituting into the formula  EMBED Equation.DSMT4 , we get:  EMBED Equation.DSMT4  As we want to calculate the length c and as the middle part of the formula is completely known, we delete the first part of the formula:  EMBED Equation.DSMT4  Rearranging this formula (by multiplying by sin72) gives:  EMBED Equation.DSMT4  i.e. c = 15.7 cm (to 1 decimal place). Example: Finding the length of an angle The diagram shows triangle LMN. Calculate the size of angle LNM.  Solution: Step 1: Label the triangle using the conventions outlined earlier. Step 2: Substitute information from the diagram into the sine rule formula  EMBED Equation.DSMT4 . Step 3: Delete the unnecessary part of the formula. Step 4: Rearrange and then work out the size of the required angle. In our example, the labelled triangle looks like:  The cosine rule formula (adjusted for our lettering) is:  EMBED Equation.DSMT4  Substituting into this gives:  EMBED Equation.DSMT4  We want to find angle N and we know the middle part of the formula completely. We therefore delete the first part of the formula, leaving  EMBED Equation.DSMT4  If we multiply by 6.9, we get:  EMBED Equation.DSMT4 . So angle N = SHIFT sin 0.2836 = 16.5 (to 1 d.p.) Examination style question In triangle ABC, angle ABC = 65, angle ACB = 38, BC = 15 cm.  Work out the length of AB. Examination style question: In triangle ABC, angle BAC = 115, AC = 5 cm and BC = 9 cm. Calculate the size of angle ABC.  Cosine Rule The cosine rule also connects the length of sides and angles in any triangle ABC:  It states that:  EMBED Equation.DSMT4  Equivalently, we also have these formulae:  EMBED Equation.DSMT4   EMBED Equation.DSMT4  You need to be familiar with the structure of these formulae. In particular note that the letter that appears as the subject of the formula also appears as the angle. Note that the cosine rule can be considered as an extension of Pythagoras theorem. Example: Finding the length of a side  The diagram shows triangle ABC. Calculate the length of side AB. Solution: To find the length of a side using the cosine rule, follow these steps: Step 1: Label the triangle using the conventions outlined earlier. Step 2: Write down the appropriate version of the cosine rule formula and substitute information from the diagram into it. Step 3: Work out the length of the required side.  Our labelled diagram here is: As we wish to find the length of c, we need the formula with c as the subject:  EMBED Equation.DSMT4  Substitute in:  EMBED Equation.DSMT4  Typing the right hand side into a calculator (in one long string and pressing = only at the end) gives:  EMBED Equation.DSMT4  Square rooting gives c = 17.0 cm Example: Finding the length of an angle  The diagram shows triangle BCD. Calculate the length of angle BDC. Solution: To find the length of a side using the cosine rule, follow these steps: Step 1: Label the triangle using the conventions outlined earlier. Step 2: Write down the appropriate version of the cosine rule formula and substitute information from the diagram into it. Step 3: Rearrange and work out the length of the required angle. The labelled diagram here looks like:  We want to find angle D. We therefore need to write down a version of the cosine rule formula that contains angle D. The subject of the appropriate formula would therefore be d2:  EMBED Equation.DSMT4  Substituting into this formula gives:  EMBED Equation.DSMT4  Therefore  EMBED Equation.DSMT4  i.e. D = SHIFT cos 0.56206 = 55.8 Worked Examination Question In triangle ABC, AB = 9 cm, BC = 15 cm and angle ABC = 110.  Calculate the perimeter of the triangle. Give your answer correct to the nearest cm. Solution: In order to calculate the perimeter, we need to work out the length of the third side. Labelling the triangle: Using the cosine rule:  EMBED Equation.DSMT4   EMBED Equation.DSMT4   EMBED Equation.DSMT4  i.e. b = 20 cm (to nearest cm) So perimeter = 20 + 15 + 9 = 44 cm (to nearest cm) Past examination question (Edexcel): In triangle ABC, AB = 7cm, BC = 12 cm and angle ABC = 125. Calculate the length of AC. Past examination question (SEG): The diagram shows triangle ABC. AB = 8.6 cm, BC = 3.1 cm and AC = 9.7 cm.  Calculate angle ABC. When do you use the sine rule and when do you use the cosine rule? In an examination, you will need to decide whether to use the sine rule or the cosine rule. It is helpful to remember that you will need to use the sine rule unless 1) you are told all three sides, in which you can use the cosine rule to find any angle; 2) you are given 2 sides and the angle in between, in which case you can find the final side using the cosine rule. Worked example:  Calculate a) the length AC; b) angle ADC. Solution Consider first triangle ABC. In this triangle we know two sides and the included angle (i.e. the angle in between). We can therefore use the cosine rule to find the third side, AC.  Using the cosine rule:  EMBED Equation.DSMT4   EMBED Equation.DSMT4   EMBED Equation.DSMT4  b = 6.89 cm Therefore AC = 6.9 cm (to 1 d.p.) (b) To find angle ADC, we now consider triangle ADC:  We are not in either of the situations where the cosine rule can be used, so here we will be using the sine rule:  EMBED Equation.DSMT4  Substituting into this formula gives:  EMBED Equation.DSMT4  Rearranging gives:  EMBED Equation.DSMT4  So D = 31.5 Examination Question (Edexcel June 2001)  Diagram NOT accurately drawn. a) Calculate the length of AB. Give your answer in centimetres correct to 3 significant figures. b) Calculate the size of angle ABC. Give your answer correct to 3 significant figures. Examination Question (Edexcel November 1998)  In the quadrilateral ABCD, AB = 6 cm, BC = 7 cm, AD = 12 cm, angle ABC = 120, angle ACD = 70. Calculate the size of angle ADC. Give your answer correct to 3 significant figures. Area of a triangle The area of a triangle can be found using this alternative formula:  Area of a triangle =  EMBED Equation.DSMT4  Alternative versions are: Area =  EMBED Equation.DSMT4  or Area =  EMBED Equation.DSMT4  This can equivalently be thought of as Area = product of two sides sine of the included angle. Example: Find the area of the triangle: We can use the above formula to find the area of this triangle as we have two sides and the included angle (i.e. the angle in between the given sides): Area =  EMBED Equation.DSMT4  (to 3 s.f.) Worked examination question Angle ACB = 150. BC = 60 m. The area of triangle is 450 m2. Calculate the perimeter of triangle ABC. Give your answer correct to 3 significant figures. We can use the formula for the area of a triangle to find the length of AC:  Area =  EMBED Equation.DSMT4  So  EMBED Equation.DSMT4   EMBED Equation.DSMT4  So b = 30 m. To find the perimeter, we also need the length AB. We can use the cosine rule:  EMBED Equation.DSMT4   EMBED Equation.DSMT4   EMBED Equation.DSMT4  So c = 87.3 m Therefore the perimeter is 30 + 60 + 87.3 = 177.3 = 177 m2 to 3 SF. Examination question (June 2004)  AB = 3.2 cm. BC = 8.4 cm. The area of triangle ABC is 10 cm2. Calculate the perimeter of triangle ABC. Give your answer correct to 3 SF. Examination style question  In triangle PQR, PQ = 9 cm, angle PQR = 67 and angle QPR = 60. Calculate the area of triangle PQR. Problem style questions Questions are often set involving bearings or angles of elevation. If a diagram has not been drawn in the question, you will need to begin by sketching a diagram to illustrate the situation. There will usually be several steps required in order to get to the solution. Worked examination question (Edexcel June 2006) The diagram shows a vertical tower DC on horizontal ground ABC. ABC is a straight line. The angle of elevation of D from A is 28. The angle of elevation of D from B is 54. AB = 25 m. Calculate the height of the tower. Give your answer to 3 significant figures. Solution: Step 1: Use triangle ADB to find the length DB. Step 2: Use triangle DBC to find the height DC. Step 1: From the original diagram, we can deduce that angle ABD = 126 and angle ADB = 26. Using the sine rule:  EMBED Equation.DSMT4  So  EMBED Equation.DSMT4   Step 2: Using trigonometry for right-angled triangles:  EMBED Equation.DSMT4  So the tower is 21.7 m tall. Examination question (NEAB) A helicopter leaves a heliport H and its measuring instruments show that it flies 3.2 km on a bearing of 128 to a checkpoint C. It then flies 4.7 km on a bearing of 066 to its base B.  a) Show that angle HCB is 118. b) Calculate the direct distance from the heliport H to the base. 3D trigonometry Grade A/ A* questions often involve you finding distances and angles in 3 dimensional objects. The key to these questions is to identify and draw the relevant 2 dimensional triangle. Example 1: ABCDEFGH is a cuboid with dimensions 8cm, 6cm and 5cm (as shown in the diagram). X is the midpoint of side HG. a) Find length AC. AC is length diagonally across the base of the cuboid. * We start by sketching the base ABCD and we mark on the length we want to find:  * We identify a relevant right-angled triangle (here obviously triangle ABC). * We can then use Pythagoras theorem to find AC: AC2 = AB2 + BC2 AC2 = 62 + 82 AC2 = 100 So AC = 10 cm b) Find the length AG * We begin by identifying a relevant right-angled triangle. Here we use triangle AGC (we use this triangle because C is vertically below G). We mark on the diagram all the lengths we know:  We now use Pythagoras theorem to find AG: AG2 = AC2 + CG2 AG2 = 102 + 52 AG2 = 125 So AG = 11.2 cm c) Find angle GAC. The letters mentioned in the name of the angle tell you which triangle to draw (i.e. triangle GAC). This is the triangle drawn in part (b). We can use trigonometry to find angle GAC.  tan =  EMBED Equation.DSMT4  i.e  = 26.6 d) Find the length AX. * AX is a diagonal length across the cuboid. Let Y be the point vertically below X. We draw triangle AXY:  * There is not yet enough information in the diagram to find length AX. * We can work out length AY however if we draw out the base ABCD:  We can use Pythagoras theorem to find AY: AY2 = AD2 + DY2 AY2 = 62 + 42 AY2 = 52 So AY = 7.2111 cm (note that we dont round too early). Now we can find AX from triangle AXY:  AX2 = AY2 + XY2 AX2 = 7.21112 + 52 AX2 = 77 So AY = 8.775 cm = 8.8 cm (to 1 DP) e) Find angle AXB We begin by drawing out triangle AXB (i.e. the triangle with the same letters as the angle we want). This is an isosceles triangle as AX = XB.  We begin by finding :  EMBED Equation.DSMT4   = 27 So angle AXB = 54 Example 2: ABCDE is a square-based pyramid. The length AB is 8cm. Point E is vertically above point X, the centre point of square ABCD. The height of the pyramid, EX, is 7cm. a) Calculate length AC. * AC lies along the base of the pyramid. We therefore begin by drawing out the base.  Triangle ABC is a right-angled triangle. We can therefore use Pythagoras theorem to find AC: AC2 = 82 + 82 AC2 = 128 AC = 11.3 cm b) Calculate length AE. * The point below E is point X. We therefore draw out triangle AEX.  Note: AX is half of AC, i.e. 5.65 cm. We can find AE using Pythagoras theorem: AE2 = 72 + 5.652 AE2 = 81 AE = 9.00 cm c) Calculate angle EAC. * This angle is the same as angle EAX. We can calculate this angle using the diagram in (b). Using trigonometry  EMBED Equation.DSMT4   EMBED Equation.DSMT4  So angle EAC = 51.1 d) Calculate the area of face AEB. * We begin by drawing out triangle AEB, an isosceles triangle (AE = EB).     * One way to find the area of triangle AEB would be to find the height of this triangle (by splitting it into 2 right-angled triangles) and then using the formula bh. Alternatively, we could find angle AEB (for example using the cosine rule) and then using the formula: area = absinC. If we use the first method, then we must begin by finding the height h of the triangle. Using Pythagoras theorem: h+ 4 = 9 h+ 16 = 81 h = 65 h = 8.06 cm Therefore the area is  EMBED Equation.DSMT4  Examination question (Edexcel November 2004) The diagram represents a cuboid ABCDEFGH. CD = 5 cm, BC = 7 cm, BF = 3 cm. a) Calculate the length of AG. Give your answer correct to 3 significant figures. b) Calculate the size of the angle between AG and the face ABCD. Give your answer correct to 3 significant figures. Examination question (Edexcel November 2005) The diagram shows a pyramid. The base, ABCD, is a horizontal square of side 10 cm. The vertex V is vertically above the midpoint, M, of the base. VM = 12 cm. Calculate the size of angle VAM.  Examination question (Edexcel) The diagram represents a prism. AEFD is a rectangle. ABCD is a square. 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