0580/13 Oct/Nov 2025, Question 19: Interior and Exterior Angles of Polygons
Cambridge IGCSE Mathematics 0580 · Paper 13 (Core) · Non-calculator · 2 marks
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The question, in short
Work out how many sides a regular polygon has when each interior angle is 160°.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 2 marks
- 1Exterior angle = 180 − 160 = 20°
- 2Number of sides = 360 ÷ 20 = 18
Answer18
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