Posted by Thomas on .
A cylinder is to be made of circular crosssection with a specified volume. Prove that if the surface area is to be a minimum, then the height of the cylinder must be equal to the diameter of the crosssection of the cylinder.
Maybe it's the wording, but I have not been able to crack this one for the past halfhour!

Math. HELP! 
Reiny,
Patience,
You just posted the same question 5 minutes ago
http://www.jiskha.com/display.cgi?id=1290049020