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| Math Central | Quandaries & Queries |
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Question from christian, a student: how many cubic feet are in a pipe that is 3" (inside diameter) and 459 feet long? |
Christian,
A pipe is a cylinder and the volume of the cylinder is equal to its cross-sectional area (the area of the circle) multiplied by the length.
So convert 3" to 0.25 feet, then take half of that as the radius of the pipe in feet: 0.125.
Now calculate the volume in cubic feet: V = (pi) r2 d, where r is the radius, d is the length of the pipe, and pi is about 3.14159.
Cheers,
Stephen La Rocque.
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