Answer

In $\triangle PQR$ and $\triangle LMN$
$\frac{ PQ }{ LM }=\frac{6}{3}=2$
And $\frac{ QR }{ MN }=\frac{8}{4}=2$
And $\frac{ PR }{ LN }=\frac{10}{5}=2$
$\Rightarrow \frac{ PQ }{ LM }=\frac{ QR }{ MN }=\frac{ PR }{ LN }=2$
$\Rightarrow \triangle PQR \sim \Delta LMN$ (By SSS Similarity Test)

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