0580/12 Oct/Nov 2023, Question 21: The Cosine Ratio
Cambridge IGCSE Mathematics 0580 · Paper 12 (Core) · Calculator · 3 marks
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The question, in short
In right-angled triangle ABC with the right angle at B, BC = 18 cm and angle ACB = 34°, calculate the length of AC.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 3 marks
- 1cos 34 = 18/AC
- 2AC = 18 ÷ cos 34
- 3= 21.71… ≈ 21.7 cm
Answer21.7 or 21.71…
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