I am stumped on this question. I think I'm missing something really obvious but here is goes.

"You have been asked to design a 1000cm^3 can shaped like a right cylinder. What dimensions will use the least material?"

So I have V = \(\displaystyle \pi r^2h\)

Which is given for obvious reasons. But I really don't know how to go from there.

If I get the derivative of the formula I will have 2 variables and then I start to confuse myself.