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The radius of a cylinder is half the thickness of its circular cross section.
If the wire has a circular cross-section - the usual case - use the formula for the circle: pi x radius squared.
It is half the thickness (diameter) of the circular cross-section of the cylinder.
It is the square root of ratio moment of inertia of the given axis to its mass.
Volume of a cylinder = (pi) x (Radius)2 x (Length)