0580/23 Oct/Nov 2021, Question 17: Interior and Exterior Angles of Polygons
Cambridge IGCSE Mathematics 0580 · Paper 23 (Extended) · Calculator · 2 marks
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The question, in short
A regular polygon has each interior angle equal to 178.5°. Work out how many sides the polygon has.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 2 marks
- 1Exterior angle = 180 − 178.5 = 1.5°
- 2n = 360 ÷ 1.5
- 3n = 240
Answer240
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