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 semicircle y=-sqrt1-x^2 tot the semicircle y=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?