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Well first remember that volume is area times height. So first think about what the area of a cross-section of a pipe would be. The cross section would be a circle, and we know the circle is 3 inches in diameter. So use the formula for area of a circle (pi times the radius squared) and multiply that by the length of the pipe. Remember that the radius is half the diameter. Still need help?

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15y ago
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14y ago

assuming that "1 inch" means the inner diameter,

r = 0.5 inches

volume = (pi x r2) x 12 inches [I converted feet to inches to keep the units the same]

volume = 9.42 cubic inches

If the outer diameter is one inch, subtract the thickness of the pipe from 0.5 and recalculate

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13y ago

9.425 cubic inches or 0.0408 gallons of liquid.

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13y ago

V = 1.473 ft3

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14y ago

0.88357 cubic feet.

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Q: Volume of a 3 inch diameter pipe 30 foot long?
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