4MA1/1F Jan 2020, Question 22: Choosing the Right Trigonometric Ratio
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 3 marks
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The question, in short
In right-angled triangle PQR, right angle at R, PR = 24.3 cm and angle QPR = 63°. Calculate PQ to 3 significant figures.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 3 marks
- 1cos 63 = 24.3 / PQ
- 2PQ = 24.3 / cos 63
- 3PQ = 24.3 / 0.4540
- 4PQ = 53.5
Answer53.5
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