the rockford's have a square play area that is built around a center sandbox that is in the shape of a circle. the sides of the play area are tangent to the circle . they want to determine the amount of grass seed to but for the spring. if the diameter of the circular sandbox is represented by d use function notation to write a function to represent the play area only.
The area of the square area is d^2. And the area of sandbox is πr^2=πd^2/4. So the area of play area equals to the square area minus area of sandbox which is d^2-πd^2/4.
