maths

The bearing of two points Q and R from a points P are 030 degree and 130 degree respectively. If PQ is12cm and PR is 5cm, find QR

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  1. use the law of cosines:

    QR^2 = PQ^2 + PR^2 - 2 PQ PR cos 130

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  2. make that 100° (130-30)

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