alleryStart learning →A closed cylinder of fixed volume has least surface area when its height h equals what?
A4r
Br/2
Cr
D2r
Answer & Solution
Correct answer: D. 2r
Minimising S = 2 pi r^2 + 2V/r gives V = 2 pi r^3, so h = V/(pi r^2) = 2r.
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