So you have a circle and a square. I think there has to be more info!
The question is:
The oval athletic field is the union of a square and semicircles at opposites ends, as shown in Figure. If the area of the field is 1300 square yards, find the dimensions of the square.
Basically the figure is a football field with two semicircles at the end. I can do this problem forward, but going backward is not going so well.