Each interior angle of a regular polygon is 144°. How many sides does the polygon have?

A8

B9

C10

D12

Explanation

Exterior angle = 180° – 144° = 36°. Number of sides n = 360° / Exterior angle = 360° / 36° = 10.

Exam Relevance

Topic: Geometry & Mensuration
Subtopic: Polygons

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