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The '''parallel axis theorem''', or '''parallel axes rule''', can be used to find the [[moment of inertia]] of a [[rigid object]] about any axis, given the moment of inertia of the object about the parallel axis through the object's [[center of mass]] and the perpendicular distance between the axes.
Let <var>I<sub>G</sub></var> denote the moment of inertia of the object about the center of mass, <var>M</var> the object's mass and <var>a</var> the perpendicular distance between the two axes. Then the moment of inertia about the new axis is given by:
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