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JAMB Mathematics 2001 Question 21

Question 21

Angles and Polygons

Find the number of sides of a regular polygon whose interior angle is twice the exterior angle.

  1. A.2
  2. B.3
  3. C.6
  4. D.8
Show the answer and explanation

Answer: C (6)

Explanation

Interior + exterior = 180° and interior = 2 × exterior, so the exterior angle is 60°. The polygon has 360 ÷ 60 = 6 sides.