Moment of inertia of a plane are about the centrodial axis
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The moment of inertia (MI) of a planearea about an axis normal to the planeis equal to the sum of the moments of inertia about any two mutually perpendicular axes lying in the planeand passing through the given axis.
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Rotational inertia is important in almost all physics problems that involve mass in rotational motion. It is used to calculate angular momentum and allows us to explain (via conservation of angular momentum) how rotational motion changes when the distribution of mass changes.
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