Question

If a central angle Ф radians intercepts an arc length of 15 cm on a circle of radius 3 cm, what is the value of Ф

Answer 1

First, I like to draw a picture.

We know the formula for arc length is

s = r theta where theta is in radians

15 = 3 theta

Divide each side by 3

15/3 = theta

5 = theta

5 radians