Question

a circle with circumference 20 has an arc with a 72 degrees central angle. what's the length of the arc

Answer 1

4 units.

Explanation:

Let's use a ratio

72 : 360

8 : 40

1 : 5

The arc is
`(1)/(5)` of the total circumference.

`(1)/(5) *20=4`

The arc length is 4