4024/21 Oct/Nov 2025, Question 7: Angles in polygons
Cambridge O Level Mathematics 4024 · Paper 21 (Calculator) · Calculator · 2 marks
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The question, in short
Find the size of one interior angle of a regular 10-sided polygon (decagon).
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 2 marks
- 1Exterior angle = 360 ÷ 10 = 36°
- 2Interior angle = 180 − 36 = 144°
Answer144
Stuck on a step? Read the free lesson: Interior and Exterior Angles of Polygons
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Also searched as: 4024/21/O/N/25 · 4024_w25_qp_21 · 4024 w25 21 · question 7.
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