if you mean a cylinder with a hole through it like a pipe or tube, then it's
pi x (Od2 - id2)/4 x h
Od = outer diameter
id = inner diameter
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Volume of cylinder: base squared times length
v=l*b
Volume of a cylinder in cubic units = piradius2height
The diameter, alone, is not enough to find the volume of a cylinder. You need the height as well. > Where pi = 3.1416, and d = cylinder diameter cylinder volume = pi * (d/2)2 * length of cylinder
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