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JAMB Mathematics 1991 Question 34

Question 34

Angles and Polygons

If the exterior angles of a pentagon are x°, (x + 5)°, (x + 10)°, (x + 15)° and (x + 20)°, find x.

  1. A.118°
  2. B.72°
  3. C.62°
  4. D.36°
Show the answer and explanation

Answer: C (62°)

Explanation

Exterior angles add up to 360°: 5x + 50 = 360, so x = 62.