0580/13 Oct/Nov 2023, Question 20: Arc Length
Cambridge IGCSE Mathematics 0580 · Paper 13 (Core) · Calculator · 2 marks
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The question, in short
A sector has radius r cm and angle 72°, with arc length 9.35 cm. Calculate the value of r.
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Solution · 2 marks
- 1Arc length = 72/360 × 2 × π × r = 9.35
- 2r = 9.35 × 360 ÷ (72 × 2π)
- 3r = 7.440… ≈ 7.44
Answer7.44 or 7.439 to 7.440…
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