2. Trig Ratios C 5 2 A M 4. If C = 20º, then cos C is equal to:
Be sure to discuss if C = 20, then sin C would equal ?
4. If C = 20º, then cos C is equal to:
A. sin 70 B. cos 70 C. tan 70

3. Using Trig to Find Missing Angles and Missing Sides

4. Finding a missing side. (Figuring out which ratio to use and getting to use a trig button.)

5. Ex: 6. Figure out which ratio to use. Find x
Ex: 6 Figure out which ratio to use. Find x. Round to the nearest tenth.
20 m x A O

6. Ex: 7 Find the missing side. Round to the nearest tenth.
80 ft x O A

7. Ex: 8 Find the missing side. Round to the nearest tenth.

8. Ex: 9 Find the missing side. Round to the nearest tenth.
20 ft x A

9. When we are trying to find a side we use sin, cos, or tan.
When we are trying to find an angle we use (INVERSE) sin-1, cos-1, or tan-1.