1. Warm-Up Write the sin, cos, and tan of angle A. A BC 15 21 28

2. Geometry 8-3 Solving Right Triangles

3. Finding Corresponding Angles Use the trigonometric ratio to determine which angle of the triangle is A.

4. Another Example Use the given trigonometric ratio to determine which angle of the triangle is A.

5. Inverse Trig Ratios If you know the sine, cosine, or tangent of an acute angle measure, you can use the inverse trigonometric functions to find the measure of the angle.

6. Examples Find each inverse. A. cos -1 (0.87)B. sin -1 (0.85)C. tan -1 (0.71) A BC 12 16 20 D. cos -1 (A)

7. Using Inverses Find each missing measure.