A circular piece of plywood has a radius of *x* inches. Four holes, each having a radius of *y* inches, are removed from the piece. Write a formula for the area of the remaining wood. (These holes don’t overlap each other at all.) Evaluate your formula if *x* = 10 inches and *y* = 2 inches. (Use ≈ 3.14).

The area of the original plywood is *x*^{2}.

Each hole has an area *y*^{2}; there are four of them.

Thus the remaining area is *x*^{2} – 4*y*^{2}.

If *x* = 10 and *y* = 2 and we use ≈ 3.14, we get

3.14 (100) – 4(3.14)(4) = 263.76 in^{2}.