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The volume of a 39 inch cylinder that has a diameter of 24 inches is approximately 10.21 cubic feet. The base is a circle of a radius of 1 foot. The height is a little less than four feet, actually 39/12 feet. The area of the base is Pi x R x R. That is 3.14159 x 1 x 1. Multiply this by the height, and you get 3.14159 x 39/12, or 10.21 cubic feet. About the size of the inside of a 75 gallon water heater. Most water heaters are about this tall on their inside, and are usually 16 to 24 inches in diameter.

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Q: What is the volume of a cylinder 39 IN tall 24 IN across?
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