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## Homework Statement

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] a

^{2}.

So any ideas?

## Homework Equations

The teacher mentioned that the divergence theorem would be the best way to go.

## 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.