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Prob 5.png
 
If \(PA\) \(=\) 2 \(cm\), \(QA\) \(=\) 5 \(cm\) and \(PR\) \(=\) 9 \(cm\), then find the length of \(QR\).
 
Answer:
 
The length of \(QR\) \(=\)  \(cm\).