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-- Surface area of each circular end of the cylinder = (pi) R2 = 4 pi square feet.

-- Surface area of the wrap-around wall of the cylinder = (pi D) x (length) = 32 pi square feet.

-- Total exterior surface of the tank = (4 pi) + (32 pi) = 36 pi = 113.1 square feet .

-- One gallon of paint will cover the external surface 3.095 times, or else both

the inside and outside of the tank 1.547 times.

-- You haven't told us how much paint is in one can.

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