Radian measure of an angle
Answers are for parents and teachers.
1
Find the radian measure of 120°.
2π/3
2
Express 7π/6 radians in degrees.
210
3
For R = 7 cm and α = 3 rad, find the arc length (cm).
21
4
Find the area (cm²) of a sector with R = 10 cm and α = 1 rad.
50
5
Which is larger, 1 radian or 60°? Explain.
60° = π/3 ≈ 1.05 rad > 1 rad (1 rad ≈ 57.3°), so 60° is larger.