1. The problem statement, all variables and given/known data The shaded band shown here is cut from a sphere of radius Rby parallel planes hunits apart. Show that the surface area of the band is 2piRh. The image is on this site: http://imgur.com/TCx1weD http://imgur.com/TCx1weD 3. The attempt at a solution How do I do this? I thought that it was given that the dS= 2pi*r dL, so since dL=h, it would simply be dS=2pi*rh, but then that doesn't make a lot of sense because I would have to take the integralto find x, but what are the points that I am taking the integral from? I am a bit confused. Please advise if you can. Anytime I do this problem, I'm getting that ds= 2piR*dL, which is where I'm trying to get, but to find s, wouldn't you have to take the integral of that? This is where I'm confused.