Question: Seven identical circular planar disks, each of mass $M$ and radius $R$ are welded symmetrically as shown. The moment of inertia of the arrangement about the axis normal to the plane and passing through the point $P$ is :
$\frac{55}{2} \mathrm{MR}^{2}$
$\frac{73}{2} \mathrm{MR}^{2}$
$\frac{181}{2} \mathrm{MR}^{2}$
$\frac{19}{2} \mathrm{MR}^{2}$
Correct Option: , 3
Solution:
