Download Geometry 8-3

Warm-Up
• Write the sin, cos, and tan of angle A.
A
15
B
28
21
C
Geometry 8-3
Solving Right Triangles
Finding Corresponding Angles
Use the trigonometric
ratio
to
determine which angle
of the triangle is A.
Another Example
Use the given trigonometric
ratio to determine which
angle of the triangle is A.
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.
Examples
• Find each inverse.
A. cos-1(0.87)
B. sin-1(0.85)
C. tan-1(0.71)
A
D. cos-1(A)
12
B
20
16
C
Using Inverses
• Find each missing measure.