A 'circle' that has height, like a piece of pipe or a can of beans, is called a "cylinder".
Volume of a cylinder = (pi) x (radius)2 x (height) = (pi) (30)2 (8) =
22,619.5 cubic feet = 169,205.4 gallons = 837.76 cubic yards (all rounded)
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The formula for the volume of a cylinder is the area of the base times the height. The base is a circle, with area = pi * radius² = 16pi feet². Multiply that by the height of 10 feet and the answer is 160pi feet³.
188.49555922 feet (to eight decimal places)
The circumference is pi times twice the radius, and the diameter is twice the radius, so the circumference is pi times the diameter: 25.13278 feet.
If 8 feet is the diameter of a circle, the circumference is: about 25.13 feet.
The circumference of a circle with a diameter of 2 feet is 6.28 feet.