Posted by **Jen** on Tuesday, September 30, 2008 at 9:36pm.

Calculate the Volume in Cubic Feet of a section of drainage pipe that measures 8 feet in length and 24 inches in diameter. I know that all measurements must be un the same units.

So there re 12 inches in 1 foot...so it would be 12*8=96 inches

3.14*12=37.68*12=452.16*96=43407.36

then I have to convert to cubic feet.

43407.36^1728= 25.12 cubic feet

IS this correct

- Math -
**Ms. Sue**, Tuesday, September 30, 2008 at 9:38pm
It seems to me that it's easier to convert the radius to 1 foot and then solve the problem.

- Math -
**Jen**, Tuesday, September 30, 2008 at 9:47pm
How many cubic feet in a foot?

- Math -
**PsyDAG**, Wednesday, October 1, 2008 at 1:30pm
There are no cubic feet in a foot. However, there are 12^3 (12 * 12 * 12) cubic inches in a cubic foot.

For the volume of a drainage pipe (which I assume is circular), you need to multiply the area of a circle (Pi * r^2) by the length. It doesn't look like you have done that.

I hope this helps a little more. Thanks for asking.

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