How many cubic yards are in a 20 foot 16 inch pipe?

Answer 1

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