



 
Christian, A pipe is a cylinder and the volume of the cylinder is equal to its crosssectional area (the area of the circle) multiplied by the length. So convert 3" to 0.25 feet, then take half of that as the radius of the pipe in feet: 0.125. Now calculate the volume in cubic feet: V = (pi) r^{2} d, where r is the radius, d is the length of the pipe, and pi is about 3.14159. Cheers,  


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