# Math Help - Circle Within Square

1. ## Circle Within Square

A circle of radius r is inscribed in a square.

(a) Express the area A of the square as a function of the radius r of the circle.

(b) Express the perimeter p of the square as a function of r.

2. Originally Posted by blueridge
A circle of radius r is inscribed in a square.

(a) Express the area A of the square as a function of the radius r of the circle.

(b) Express the perimeter p of the square as a function of r.
C'mon. Draw a picture of this. You'll easily see that the diameter of the circle is the same length as a side of the square. You can do the rest from there.

-Dan