What is the exact answer in terms of pie

Question

A circular mirror is surrounded by a square metal frame. The radius of the mirror is 5x. the side length of the metal frame is 15x. What is the area of the metal frame? The area of the frame is __ square units.

Answer 1

Nick,

net area of the frame = (15x)²-π(5x)²=225x²-25πx²=(225-25π)x²

Can't give a numerical answer without knowing a value of x

Jim