0580/21 Oct/Nov 2025, Question 3: 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
Calculate the size of one interior angle of a regular polygon with 20 sides.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 2 marks
- 1Exterior angle = 360 ÷ 20 = 18°
- 2Interior angle = 180 − 18 = 162°
Answer162
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