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S and T are points on sides PR and QR of $\triangle$ PQR such that $\angle P = \angle RTS$. Show that $\triangle$ RPQ $\sim \triangle$ RTS.
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In $\triangle$ RPQ and $\triangle$ RTS,
$\angle P = \angle RTS$
$\angle PRT = \angle SRT$
$\therefore \triangle RPQ \sim \triangle RTS$_a_1.png)
$\angle P = \angle RTS$
$\angle PRT = \angle SRT$
$\therefore \triangle RPQ \sim \triangle RTS$
_a_1.png)