Please explain how you get the answer
Arc length = 2pi (radius) (x / 360)
Where x is the angle(in degrees) we're looking for
So we have
15 pi = 2pi (60) (x /360) divide pi out and simplify
15 = 2 (60) * x /360 multiply both sides by 360
5400 = 120 x divde both sides by 120
45° = x
