1. The problem statement, all variables and given/known data Use Cavalieri's Principle to find the volume of a spherical segment of one base and thinckness h if the radius of the sphere is r. 2. Relevant equations http://img395.imageshack.us/img395/2826/sphere1.jpg [Broken] Volume of half-sphere: 2/3[tex]\pi[/tex]r2 Volume of cone inverse to half-sphere: 1/3 [tex]\pi[/tex]r2 3. The attempt at a solution I've been working this for the last three days and can't see how the answer is derived. The best I've been able to do is work out a cone with height and radius [tex]\alpha[/tex] where [tex]\alpha[/tex]= r-h But I haven't had any success this way, and question its usefulness. If need be, I can post what the answer is supposed to be, I'm just interested in how its derived.