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Figure 2-19 Drawing for Example 15. a d 65° 31° 120 First, calculate the sizes of angles α and β. Then find the value of a using the Law of Sines. Finally, use the definition of the sine to find the value of d. 9063h a. 5592 a . 5 Finally, sin 31% . 5 d . 5150h d . F 7/27/01 8:47 AM Page 43 Chapter 2: Trigonometry of Triangles 43 Example 16: (AAS) Find the value of x in Figure 2-20. Figure 2-20 Drawing for Example 16. 41 110° 22° x First, calculate the size of angle α. Then use the Law of Sines to calculate the value of x.

Find the length of the hypotenuse. You are standing 400 feet from the base of a building. The angle elevation to the top of the building is 28°. Find the height of the building. Find the size of the smallest angle in a triangle if the three sides measure 7 inches, 8 inches, and 10 inches. Two sides of a triangle measure 12 feet and 18 feet, and the angle between them measures 16°. Find the length of the third side. True or False: In some cases, the law of sines will not provide you with a unique answer.

9744h f. 5299 f . 07 Example 11: Solve the triangle in Figure 2-12 given a = 125%, b = 35%, and b, = 42. Figure 2-12 Drawing for Example 11. a c b From the fact that there are 180° in any triangle, then c = 180% - a - b c = 180% - 125% - 35% c = 20% Again, using the Law of Sines, 42 = c sin 35% sin 20% 42 . 3420h c. 5736 c . F 7/27/01 8:46 AM Page 35 Chapter 2: Trigonometry of Triangles 35 42 = a sin 35% sin 125% 42 . 8192h a. 5736 a . 98 The second use of the Law of Sines is for solving a triangle given the lengths of two sides and the measure of the angle opposite one of them.

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