Verify the equation $BO/MN= (NH/LH)(KL/MN)$ in relation to curvature?

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Verify that $BO/MN= (NH/LH)(KL/MN)$, and state why $$ \frac{BG}{GM}= \frac{HN}{HL} \frac{KL}{MN}$$

I am unsure how to even start this problem. Any help would be appreciated.