This is kind of tricky, but here are the basics: Volume is the surface area of the cylinder multiplied by the depth of the water. Do not mix feet and inches, convert all dimensions to feet or inches, depending on the application. To calculate the surface area, measure the inside diameter of the cylinder, divide the diameter by 2 and then multiply by Pi (3.1416). Multiply the surface area by the depth of the water and use following information for conversion: water is 231 cubic inches per gallon or 7.481 gallons per cubic foot.
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Use the formula for a cylinder.
The volume of a cylinder is represented by this formula:r2Ï€hwhere r = radius of circular baseand h = height of cylinder
You cannot have a trapezoidal cylinder. That is like a square circle - an impossible shape.
V=hπr2
The volume of a cylinder can be determined by using the formula πr2h, where r is the radius of the base of the cylinder and h is the height. For example, if you have a cylinder with a base radius of 6 and a height of 12, the formula would be π(6)2(12) = π(36)(12) = 432π = ~1,357.168 units.