1. The problem statement, all variables and given/known data I need help proving how you could use evaluation of the surface integral [tex]\oint\oint f(x,y,z)dS[/tex] to show that the surface area of the upper hemisphere of radius a is 2[tex]\pi[/tex] a2. So any ideas? 2. Relevant equations The teacher mentioned that the divergence theorem would be the best way to go. 3. The attempt at a solution Besides the hint from my teacher, i havent gotten anywhere with the problem. It's one that has stumped my entire class. If anyone has any hints at all for where I can start with this problem, I would appreciate it greatly.