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If radius is r and height is h, we have V= pir^2h = 28

Material M = 2pir^2+2pirh

Or, M = 2pir^2+2pir*(28/pir^2) =2pir^2+56/r

dM/dr = 4pir-56/r^2 = 0

Or, r^3 = 56/4pi =14/pi

or, r =(14/pi)^(1/3) = 1.65 inch

height h = 28/(pi*1.65^2) = 3.30 inch

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