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To find the volume of a cylinder (in this case the pipe) we use the equation for the area of the end circle (pi*r^2) and multiply it by the length of the cylinder (h). This gives us the equation pi*r^2*h. Our radius is half the diameter (1.5 inches) and our height/length is 8 feet or 96 inches.

In our case this equates to pi*(1.5in)^2(96in)=216pi = 678.6in^3. Since there are 231 cubic inches in a gallon, there are 678.6/231 = 2.94 gallons of water in the pipe.

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Q: How many gallons of water in a 3 inch pipe 8 feet long?
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