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The volume of a cylinder when the inside circumference is 12 feet and height is 8 feet is: 91.7 cubic feet.
It is 10.5 feet.
Assuming 30 feet is the diameter, its 94.2ft
Circumference (perimeter) = pi * diameter = 3.141592654 * 21 = 65.973 feet Surface area = pi * radius 2 = 3.141592654 * 10.5 * 10.5 = 346.36 sq. feet Volume (cu feet) = 346.36 * depth in feet . Volume * 7.4805 = US gallons Volume * 6.2288 = imp gallons (results approximate)
It is about: 4/3*pi*2^3 = 33.5 cubic feet