Take half the diameter - that's the radius. Then use the formula for the area of a circle: area = pi x radius2.
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A cylinder with a diameter of 24ft and a height of 11ft has a volume of 4,976.28 cubic feet.
circumference = {pi} x diameter circumference = {pi} x 24ft ~= 75.4ft
A = 1809.6 ft2
453
About 19.6 feet.