<p>In triangle $PQR$, $PR=15$ cm, $PQ=7.5$ cm and angle $PQR=90{}^\circ $ . <br><br></p>
<p>Calculate the length of $QR$. </p>
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In triangle $PQR$, $PR=15$ cm, $PQ=7.5$ cm and angle $PQR=90{}^\circ $ . 



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