4024/13 May/Jun 2026, Question 20: Arc Length
Cambridge O Level Mathematics 4024 · Paper 13 (Non-calculator) · Non-calculator · 3 marks
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The question, in short
Circle centre O radius 9 cm, minor arc length 15/2 π cm; find the reflex angle x at the centre.
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Solution · 3 marks
- 1Circumference = 2π × 9 = 18π
- 2Minor angle: k/360 × 18π = 15/2 π, so k = 150
- 3x = 360 − 150 = 210
Answer210
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