Answer variants:
20
10
17
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\(QR\) and \(SR\) are two tangents from the point \(R\). If \(\angle QRP\) \(=\) 60° and \(PR\) \(=\) 20 \(cm\), then find the length of \(QR\).
 
Answer:
 
The length of \(QR\) \(=\)
 \(cm\)