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WAEC Mathematics 2019 Question 33

Question 33

Angles and Polygons

The interior angles of a polygon are 3x°, 2x°, 4x°, 3x° and 6x°. Find the size of the smallest angle of the polygon.

  1. A.80°
  2. B.60°
  3. C.40°
  4. D.30°
Show the answer and explanation

Answer: B (60°)

Explanation

A 5-sided polygon has angles adding to 540°. 18x = 540, so x = 30 and the smallest angle is 2x = 60°.