4MA1/2F Jun 2019, Question 21: Bearings and Trigonometry
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 4 marks
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The question, in short
Using the given diagram, find the bearing of B from C, with B 234 km north of A and C 356 km east of A, rounded to the nearest degree.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 4 marks
- 1Triangle ABC has a right angle at A
- 2tan(BCA) = 234/356
- 3Angle BCA = tan⁻¹(234/356) = 33.3…°
- 4B is west then north of C: bearing = 270 + 33.3…
- 5= 303° (nearest degree)
Answer303
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