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The key facts: 1 gallon is 231 cubic inches.
There are 12 inches in a foot.
The formula to use is v = Length * pi * r2
A conversion to gallons will be the last step.
v = (60 * 12) * 3.14 * 152
v = 720 * 3.14 * 225 = 508,680
v in gallons = 508,680 / 231 = about 2,200 gallons. Your instructor might want a more precise answer using a more accurate value of pi.
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