Chapter 10 - NCPN

Practice and Problem Solving
Find the measure, in degrees, of each angle x. Round to the
nearest tenth if necessary.
6. sin x = 0.65, –90º ≤ x ≤ 90º 40.5º
7. cos x = 0.5, 0º ≤ x ≤ 180º 60º
8. sin x = 1, –90º ≤ x ≤ 90º 90º
9. tan x = 2.35, –90º < x < 90º 66.9º
10. cos x = 0.26, 0º ≤ x ≤ 180º 74.9º
Find the measure, in radians, of each angle x. Round to the
nearest thousandth if necessary.
11. cos x = 0.809, 0 ≤ x ≤ π 0.628 radians
12. sin x = 0.707, − π 2 ≤ x ≤ ≠ 2
13. tan x = 11.6, − π 2 < x < ≠ 2
0.785 radians
1.485 radians
14. sin x = 0, − π 2 ≤ x ≤ ≠ 2 0 radians
15. cos x = 0, 0 ≤ x ≤ π 1.571 radians
16. tan x = 1, − π 2 < x < ≠ 2
0.785 radians
Solve for the missing angle in each right triangle. Round your
answer to the nearest tenth if necessary.
17. 66.8º
18. 46.2º
19. 11.3º
452 Chapter 10 Trigonometric Functions and Identities