It depends on what you mean by a 30 pipe.
Is 30 the cross sectional area - in which case, what is the length of the pipe?
Is 30 the length - in which case, what is the cross-sectional area?
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The volume of the pipe is 1,154.5 cubic feet.
There is no obvious reason why there should be any water in the pipe. Furthermore, there are no units associated with the width of the pipe, so its volume cannot be calculated.
measure the radius of the pipe. (half the diameter - the width of the pipe) then measure the length of the pipe. then use the formula pi (3.14) x radius2 x length. the answer is the volume in the pipe
The volume of a 12 inch x 12 inch pipe is: 1,360 cubic inches
Consider the volume of the pipe as the difference in the volume of two cylinders, one containing the whole pipe and the other the empty space inside. Use the formula for the volume of a cylinder : Pi*r*r*h. Find the volume of the first cylinder with the larger radius and subtract from it that of the cylinder with the smaller radius. The height (or length) is the same for both volume calculations. The result of subtracting these is the volume occupied by the pipe.