0580/12 Oct/Nov 2022, Question 21: Choosing the Right Trigonometric Ratio
Cambridge IGCSE Mathematics 0580 · Paper 12 (Core) · Calculator · 2 marks
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The question, in short
In a right-angled triangle ABC with the right angle at B, AC is 18 cm and angle ACB is 42°. Work out the length of side BC.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 2 marks
- 1cos 42° = BC/18
- 2BC = 18 × cos 42° = 13.37… ≈ 13.4 cm
Answer13.4 or 13.37 to 13.38
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