By David A Kay

ISBN-10: 0764563890

ISBN-13: 9780764563898

*CliffsQuickReview Trigonometry* offers you all you must be aware of to appreciate the elemental recommendations of trigonometry — no matter if you would like a complement on your textbook and periods or an at-a-glance reference. Trigonometry is not only measuring angles; it has many purposes within the actual international, similar to in navigation, surveying, building, and plenty of different branches of technological know-how, together with arithmetic and physics. As you're employed your method via this overview, you will be able to take on such recommendations as

- Trigonometric services, resembling sines and cosines
- Graphs and trigonometric identities
- Vectors, polar coordinates, and complicated numbers
- Inverse features and equations

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**Example text**

Example 10: Solve the triangle in Figure 2-11 given i = 32°, z=77°, and d = 12. Figure 2-11 Drawing for Example 10. 5299 . 9455h e. 5299 e . 5299 . 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 .

05% Solution 1: The sum of the angles of a triangle is 180°. Thus, c = 180% - a - b c . 95% c . 05%k c. 9927 h c. 5736 c . 50 Solution 2: The sum of the angles of a triangle is 180°. 95%l c l. sin35 sin 35% 13 0 . 4532 ^ h^ h c l. 5736 c l. 27 Solving General Triangles The process of solving triangles can be categorized into several distinct groups. The following is a listing of these categories along with a procedure to follow to solve for the missing parts of the triangle. The assumption is made that all three missing parts are to be found.

In this case, it is possible that more than one solution will exist, depending on the values of the given parts of the triangle. The next example illustrates just such a case. Example 12: Solve the triangle(s) given a = 13, b = 20, and α = 35°. Figure 2-13 shows two possible positions for side a. This will occur if a > h. To determine if a is greater than h, the value of h is found. Figure 2-13 Drawing for Example 12. b a c' h a c sin a = h b h sin 35% = 20 h . 5736h h . 47 Therefore, a > h and the diagram shows two solutions for the triangle.

### CliffsQuickReview Trigonometry by David A Kay

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