Question

A circle with circumference 20 has an arc at 72 central angle. what is the length of the arc

Answer 1

4 units

Explanation:

`\because \: l = ( \theta)/(360 \degree) * c \\ \\ \therefore \: l = (72 \degree)/(360 \degree) * 20 \\ \\ \therefore \: l = (72 \degree)/(18\degree) \\ \\ \therefore \: l = 4 \: units`