The equivalent length of a simple pendulum which gives the same frequency as compound pendulum is

The equivalent length of a simple pendulum which gives the same frequency as compound pendulum is Correct Answer $$\frac{{{\text{k}}_{\text{G}}^2 + {{\text{h}}^2}}}{{\text{h}}}$$

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The equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is
The length of a simple pendulum which gives the same frequency as the compound pendulum, is