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:<math>I_z = I_x + Ad^2.\,</math>
where ''I<sub>z</sub>'' is the parallel axis, ''I<sub>x</sub>'' is the area moment of inertia through the [[center of gravity]] of the [[area]], ''A'' is the surface of the area, and ''d'' is the distance from the new axis ''z'' to the center of gravity of the area.
The parallel axes rule is often referred to as '''Steiner's theorem''', after [[Jakob Steiner]].
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