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In [[physics]], the '''parallel axes rule''' (also called '''Huygens-Steiner Theorem''') can be used to determine the [[moment of inertia]] of a [[rigid object]] about any axis, given the moment of inertia of the object about the [[Parallel (geometry)|parallel]] axis through the object's [[center of mass]] and the [[perpendicular]] [[distance]] between the axes.
Let ''I''<sub>''CM''</sub> denote the moment of inertia of the object about the center of mass, ''M'' the object's mass and ''d'' the perpendicular distance between the two axes. Then the moment of inertia about the new axis ''z'' is given by:
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