If a cylinder has a diameter of 4 inches, then it has a radius of two inches, and the area of that circle is pi, 3.14, times radius squared which is 4 square inches, for a total of very close to 13 square inches; multiply that by the 4 inch length of the cylinder and you get 52 cubic inches.
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The volume of a cylinder that measures 18 inches high and has a diameter of 9 inches is 1,145.11 cubic inches.
A cylinder with a diameter of 6 inches and a height of 6 inches has a volume of 169.65 cubic inches. (V = Pi*r2h)
Volume = pi*r2*h = 282.7433 cubic inches
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A cylinder that has an 18-inch diameter and is 36 inches long has a volume of: 5.3 cubic feet.