if you have a 20' length of 12" PVC pipe How much water would it contain?

this is the calculation that I am using is it correct?

0.785X1X20=15.7 (Cubic Feet)

15.7X7.48 (Gallons In a Cubic Foot)=117.436

this is the calculation that I am using is it correct?

0.785X1X20=15.7 (Cubic Feet)

15.7X7.48 (Gallons In a Cubic Foot)=117.436

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