Question

A circle with circumference 20 has an arc with a 72º central angle.

What is the length of the arc?

Answer 1

l = x · c / 360

l = 72 · 20 / 360

l = 1440 / 360

l = 4

Explanation:

1. write down the arc length formula.

2. replace x and c by their values

3. multiply and then divide to get l