0580/13 Oct/Nov 2021, Question 21: Interior and Exterior Angles of Polygons
Cambridge IGCSE Mathematics 0580 · Paper 13 (Core) · Calculator · 2 marks
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The question, in short
Calculate the size of one interior angle of a regular polygon with 7 sides.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 2 marks
- 1Exterior angle = 360 ÷ 7 = 51.43…°
- 2Interior angle = 180 − 51.43… = 128.57… ≈ 128.6°
Answer129 or 128.6 or 128.57 to 128.57...
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