Question

The perimeter of this shape is 120 π mm

What is the radius of the smaller semicircles?

Answer 1

15mm

Explanation

It says the perimeter is 120 pi, if pi is separate from 120, that would make 120 our radius 60. with 4 semicircles, divide 60 by 4 and boom, 15.

I think that's right, I was never good at geometry