1. The problem statement, all variables and given/known data Use cylindrical shells to find the volume of a torus with radii r and R. 2. Relevant equations V= ∫[a,b] 2πxf(x)dx y= sqrt(r2 - (x-R)2) 3. The attempt at a solution V= ∫ [R, R+r] 2πx sqrt(r2 - x2 - 2xR + R2) dx I feel like this isn't going in the right direction, though. I found a different post about the same question, but that person was using disks, and the volume was 2π2r2R, and I can't see where the π2 would come from in my equation, so I think I'm going about this incorrectly. Any help is much appreciated, thanks.