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Divide the volume by the hieght. The result is the area of the circle forming the cylinder. Divide the area of the circle by PI. Multiply by 4 and then take the square-root. This will be the diameter of cylinder.
A circle, ellipse, truncated ellipse or rectangle - depending on the inclination of the cross section relative to the cylinder.
V = radius2 x pi x height
Pi * r-squared * hAnswerAnd if your cylinder is not a right circular one, things get a bit tricky from there. =)
Assuming the mass is evenly distributed around the cylinder's surface, you simply find the midway points between its three axes of symmetry. The midway point of the cylinder on the x-y plane is the center of the circle projected onto it and its midway point on the z-axis is half of the cylinder's height. Therefore, the center of mass of a hollow, evenly-distributed cylinder is at the center of the circle that divides the cylinder's height in two.