Volume = Cross-sectional area X Length. So Area of a circle = PI times radius². Approximate PI with 3.14, then radius = diameter / 2 = 3 inches. (pipe normally is specified in inside diameter).
So Area = (3 in)² x 3.14 = 28.26 in². Now multiply that by length of pipe (in inches) to find volume capacity (in cubic inches) of that section of pipe.
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