Question

A circle with circumference, 20 has an arc with a 72∘ central angle. What is the length of the arc?

Answer 1

1.27

Explanation:

The arc length formula is s = rФ, where Ф is the central angle in radians.

Here, r = C / (2π), or r =20 / (6.28).

Then the arc length is s = rФ = (20/6.28)(72π/180) = 1.27