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WAEC Mathematics 1999 Question 15

Question 15

Angles and Polygons

The interior angle of a regular polygon is twice the exterior angle. How many sides has the polygon?

  1. A.5
  2. B.6
  3. C.8
  4. D.9.
Show the answer and explanation

Answer: B (6)

Explanation

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