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The volume of a cylinder is given as V = pi * r^2 * h. In exact values, meaning pi is left in the answer, the volume would be:

1/2 diameter = radius --> radius = 15 feet.

Height = 20 feet

V = pi * (15)^2 * 20

V = pi * 4500 ft^3 which is read as 4500pi cubic feet.

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