Sec 3/4 E Math T06-Q21 - Applying the cosine rule

Sec 3/4 E Math T06-Q21 - Applying the cosine rule

Secondary 3
Original parallel to Sec3&4 E Math FA

In triangle \(PQR\), \(PQ=8\) cm, \(PR=12\) cm and \(\angle QPR=48^\circ\). Calculate \(QR\), giving your answer correct to 3 significant figures.

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Answer:\(8.918\) cm.

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