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JAMB Mathematics 1982 Question 34

Question 34

Angles and Polygons

In a regular polygon of n sides, each interior angle is 144°. Find n

  1. A.12
  2. B.11
  3. C.10
  4. D.8
  5. E.6
Show the answer and explanation

Answer: C (10)

Explanation

Each exterior angle is 180° − 144° = 36°, and the exterior angles add to 360°, so n = 360 ÷ 36 = 10.