Arc length and radian measure
Answers are for parents and teachers.
1
What is the length of a 100° arc of a circle of radius 18 cm?
10π
2
What is the radian measure of 45°?
π/4
3
How many degrees is 5π/6 radians?
150°
4
The central angle is 1.5 radians and the radius is 8 cm. What is the arc length?
12 cm
5
Why is 1 radian approximately 57°?
1 radian = 180°/π, and since π ≈ 3.14, 180° : 3.14 ≈ 57°.