\(PQR\) is an isosceles triangle with \(PQ\) \(= PR\) \(=\) 65 \(cm\) and the height of the triangle \(PS\) \(=\) 56 \(cm\). Determine the base length \(QR\).
 
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The length of the base of the triangle \(PQR\) is  \(cm\).