1) pi x 36 square inches = area of a cross section of a 12 inch (round) pipe (the radius is 6 inches).
2) There are 144 square inches in a square foot (1 ft x 1 ft = 12 in. x 12 in. = 144 square inches)
So, the area of a cross section of a 12 inch pipe is (pi x 36)/144 = pi/4 square feet.
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12x12 square hole in basement floor what is it for
15.7
The circumference of 12-inch pipe is: 37.7 inches. (C = d x Pi)Since 12 inch pipe is a nominal size and its outside diameter is 12.75 inches, the circumference of 12 inch pipe actually is : 40.035 inches
48First 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.
12/(1/3) = 36 pieces