2025 CGSS PRELIMS P1 Q9

2025 CGSS PRELIMS P1 Q9

Secondary 4
5 marks

The diagram shows a triangle \(PQR\).

Point \(M\) lies on \(QR\) such that \(QM = 1\) unit and \(MR = 3\) units.

Angle \(PRQ = 90^\circ\) and \(PR\) is \(x\) units. Angles \(QPR\) and \(MPR\) are denoted by \(\alpha\) and \(\beta\) respectively as shown, where \(0^\circ < \alpha < 45^\circ\).

Given \(\tan(\alpha - \beta)=\dfrac{1}{8}\), find the value of \(x\).[5]

Solution:

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Answer:\(x=6\) units.

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