0580/12 Oct/Nov 2024, Question 20: Circumference and Area of a Circle
Cambridge IGCSE Mathematics 0580 · Paper 12 (Core) · Calculator · 3 marks
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The question, in short
Circle centre O radius r has area 120 cm²; A and B on circle with angle AOB 90°. Find area of triangle AOB.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 3 marks
- 1πr² = 120
- 2r² = 120/π = 38.19…
- 3r = 6.18…
- 4Area AOB = 1/2 × r × r = 1/2 × 38.19…
- 5= 19.1 cm²
Answer19.1 or 19.09…
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