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Bearings and the cosine rule - Pearson

A2400 ch9c | Version 1.1 | September 2020 Practice question 1 There is a coastguard station at point A and at point B. B is due East of A. The distance from A to B is 12 km. There is a rowing boat at point R. R is on a bearing of 160° from A. R is on a bearing of 220° from B. There is a speedboat at point T. T is 5 km due South of A. Work out the shortest distance from T to R.