Calculate the moment of inertia of a disc about an axis tangent to its inner circle and lying in the plane of the disc. The mass of the disc is $M$,the inner radius is $R_1$,and the outer radius is $R_2$.

  • A
    $\frac{M}{4}(R_1^2 + R_2^2) + MR_1^2$
  • B
    $M(R_1^2 + R_2^2) + MR_1^2$
  • C
    $\frac{M}{4}(R_1^2 - R_2^2) - MR_1^2$
  • D
    $\frac{M}{4}(R_1^2 + R_2^2) - MR_1^2$

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