Posted by **Thomas** on Wednesday, November 17, 2010 at 10:02pm.

A cylinder is to be made of circular cross-section 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 cross-section of the cylinder.

Maybe it's the wording, but I have not been able to crack this one for the past half-hour!

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