To do this I will assume that the circle is inside the square, touching the sides.

area of square = length * width

100 = length * width

and since it is a square, the length and width are the same ( call them both y )

100=y * y

so y is 10

so the width and length are 10, this also means the diameter of the circle is 10 (if it is touching the side of the square)

diameter = 10

area of a circle is p... more