Problem: the solid lies between planes and perp. to the x-axis at x=-1 and x=1. the cross-sections perp. to the x-axis between these planes are squares whose base run from the semicircley=-sqrt1-x^2tot the semicircley=sqrt1-x^2.

I tried drawing this in the 3-d form, with the square cross-sections, but what would be the sides? Would it be-sqrt1-x^2 *sqrt1-x^2?