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Let's say that each column is a cylinder with a height, h, of 10 ft and a base with diameter, d, of 18 in or 1.5 ft (since 1ft = 12 in) or with a radius, r, of 0.75 ft.

We need to find the surface area S.A. of the cylinder (or the column), which is given by the formula

S.A. = dpih + 2pir2

S.A. = (1.5 ft)(pi)(10 ft) + 2(pi)(0.75 ft)2 = 10pi ft2 + 1.125pi ft2 = 11.125pi ft2 ≈ 35 ft2

Q: Cafe has 12 columns each is 10 feet high with a diameter of 18 inches how many square feet in the column?

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