You will need to know the height and diameter of the cylinder. Then multiply pi (3.14159) by the square of the radius (r= exactly half of the diameter) , and then multiply that by the height.
V = πr²h
Example: The cylinder is 12 inches in diameter, and 20 inches tall
V= (3.14159 × 6²) × 20
(3.14159 × 36) × 20
113.097 × 20 = 2261.94 in³
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Volume of a cylinder = pi*(radius)2*(height) where pi = 22/7
Volume of a cylinder = pi*radius2*height
Pour it into a graduated cylinder and read off the volume.
Volume = (height)(area base)
Volume in cubic feet = cross-section area*length