Question 1070058
If the top and bottom are both made of steel (not an open top, for example), the steel needed for the top and bottom is pi*r^2*2=2pi*6^2=72 pi ft^2
The side is 2 pi*r*h, because opening it up, it is a rectangle with height h and length the circumference of a circle, 2*pi*r
That is 2*pi*6*18=216 pi ft^2.
The total area and square feet of steel needed is 288 *pi ft^2.