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Assuming the pipe can be accurately modeled by a cylinder, 20 feet is the height of the cylinder, and 16 inches is the diameter of the cylinder:
The volume of a cylinder is V=(pi)(radius)^2(height), so in this case:
V=
(pi)(16 inches)^2(20 feet)=
pi*(256 in^2)*(1 ft^2/12^2 in^2)*(20 ft)=
((pi*256*20/144) ft^3)*(1 yd^3/3^3 ft^3)=
pi*256*20/144/27 yd^3~=
4.137 yd^3
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