Rod bent into a ring: ratio of the rod's moment of inertia to the ring's about a diameter

1. A.
   $\frac{2\pi^{2}}{3}$
2. B.
   $\frac{3}{2\pi^{2}}$
3. C.
   $\frac{3\pi^{2}}{4}$
4. D.
   $\frac{4}{3\pi^{2}}$

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1. A.
   $\frac{3\pi^{2}}{2}$
2. B.
   $\ \frac{2\pi^{2}}{3}$
3. C.
   $\frac{\pi^{2}}{3}$
4. D.
   $\frac{\pi^{2}}{9}$

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1. A.
   $\dfrac{2\pi^2}{3}$
2. B.
   $\dfrac{3\pi^2}{2}$
3. C.
   $\dfrac{5\pi^2}{3}$
4. D.
   $\dfrac{8\pi^2}{3}$

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