How moment of inertia is equal to 1/2MR²
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The moment of inertia(l) of a body about an axis is given by
1 = m r2
Where m = mass of a body
r = perpendicular distance of mass m from the axis of of rotation
For cases when the body is revolving around an axis passing through its own centre like for uniform circular ring is revolving about a diameter or uniform circular disc is rotating about an axis passing through centre and perpendicular to its plane.
1 = (1/2) mr2
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