How to find degree of angle when given radius and arc length

Question

If I'm given a slice of pizza with a radius of 52 inches and crust (arc length) equal to 26pi, how do I find the angle in degrees

Answer 1

52 / 26π ≈ 0.6366^r

1^r = 180° / π

1^r ≈ 57.3°

0.6366^r ≈ (0.6366)(57.3°)