In this problem, we will find the volume of a solid with circular base of radius 22, for which parallel cross-sections perpendicular to the base are squares. to do this, we will assume that the base is the circle x2+y2=4x2+y2=4, so that the solid lies between planes parallel to the xx-axis at x=2x=2 and x=−2x=−2. the cross-sections perpendicular to the xx-axis are then squares whose bases run from the semicircle y=−4−x2√y=−4−x2 to the semicircle y=4−x2√y=4−x2.