0580/21 May/Jun 2025, Question 5: Interior and Exterior Angles of Polygons
Cambridge IGCSE Mathematics 0580 · Paper 21 (Extended) · Non-calculator · 2 marks
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The question, in short
A regular polygon has interior angle 150°; determine how many sides it has.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 2 marks
- 1Exterior angle = 180 − 150 = 30°
- 2n = 360 ÷ 30 = 12
Answer12
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