The radius of gyration of a body about an axis at a distance of `12cm` from its centre of mass is `13cm`. Find its radius of gyration about a parallel axis through its centre of mass.

Explanation

To find the radius of gyration of a body about a parallel axis through its center of mass, we can use the parallel axis theorem. The parallel axis theorem states that:

\[ I = I_{cm} + Md^2 \]

Where:
- \( I \) is the moment of inertia about the new axis,
- \( I_{cm} \) is the moment of inertia about the center of mass axis,
- \( M \) is the mass of the body,
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