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First of all, you must have meant cubic feet (volume) not square feet.

The area of a 2 ft. diameter pipe is 2*2*Pi/4 = Pi = 3.1416 sq.ft.

The volume = area*length = 3.1416*12 = 37.6991cu.ft.

"Diameter" implies a round pipe.

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12y ago
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Q: How many square feet of concrete Are in a tube 2 foot diameter x 12 foot long?
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