4MA1/1FR Jun 2019, Question 16: Interior and Exterior Angles of Polygons
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1FR (Foundation) · Calculator · 3 marks
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The question, in short
A regular polygon has each interior angle equal to 162°. 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 · 3 marks
- 1Interior + exterior angle = 180°, so exterior = 180 − 162 = 18°
- 2Exterior angles add to 360°: 360 ÷ 18 = 20 sides
Answer20
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