For the shown system, the pendulum has a total mass $m$ and mass moment of inertia about an axis passes through point B is equal to I. Find the radius of gyration about point $B($in $m).$

Note that $m=4\mathrm{.}6kg,l=0\mathrm{.}65m$ and, $I_A=0\mathrm{.}15kg*m^2$

Answer: