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Answer :
Given, S and T are point on sides PR and QR of \(\triangle\) PQR
And \(\angle\) P = \(\angle\) RTS.
In \(\triangle\) RPQ and \(\triangle\) RTS,
\(\angle\) RTS = \(\angle\) QPS (Given)
\(\angle\) R = \(\angle\) R (Common angle)
\(\triangle\) RPQ ~ \(\triangle\) RTS (AA similarity criterion)