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Trigonometric Analysis of Non-Right Angled Triangles

Trigonometric Analysis of Non-Right Angled Triangles

Secondary 3

In \(\Delta PQR\), \(PQ=5\) cm, \(PR=6.5\) cm and \(QR=\sqrt{x}\) cm.
Given that \(\cos \angle QPR = -\frac{11}{52}\), find the value of \(x\).

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Answer:\(81\)

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