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JAMB Mathematics 2011 Question 27

Question 27

Angles and Polygons

What is the size of each interior angle of a 12-sided regular polygon?

  1. A.120°
  2. B.150°
  3. C.30°
  4. D.180°
Show the answer and explanation

Answer: B (150°)

Explanation

Each exterior angle is 360° ÷ 12 = 30°, so each interior angle is 180° − 30° = 150°.