I am getting ready to pour a semi circular fire place hearth 60 inched x30 inches (semi circular- remember that- D shaped), 4 inches thick. How much concrete do I need?

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ANSWERS: 1

Ray the Remodeler

Pi x r squared times four divided by two pi 3.14 x Radius squared Five foot circle divided by two is radius which is 2.5 radius squared 2.5 x 2.5 = 6.25 3.14 times 6.25 equals 19.625 is the area of a five foot circle divide by two (semi circle) equals 9.8125 times .33 (four inches is a third of a foot)= 3.238125 cubic feet

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