6' x 20' = 120 square feet.
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20' x 6' = 120 square feet.
20 square feet.
20 x 20 = 400 square feet.
A pipe is a cylinder.Diameter = 6 inches = 0.5 feet=> Radius = 0.25 feetHeight = 20 feetVolume of a cylinder = pi * r^2 * h square units= 3.1415 * 0.25 * 0.25 * 20 square feet= 3.926875 square feet
80