



 
Hi Frank. The volume of a cylinder (a pipe is a cylinder) is (pi)r^{2}h. Where (pi) is about 3.1416, r is the radius (half the diameter) and h is the length (or height). Since you want cubic feet, you must first convert your measurements all to feet: 8 inches = (2/3) feet. Now get the radius: that's (1/2)(2/3) = (1/3) feet. Now put these values into the equation I gave at the beginning: Volume = (3.1416)(1/3 feet)^{2}(10 feet) On my calculator, I get 3.49 cubic feet.  


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