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OAU Post-UTME Mathematics 2012 Question 11

Question 11

Angles and Polygons

The interior angles of an hexagon are 120°, 100°, 80°, 150°, x and 130°. The value of x is

  1. A.170°
  2. B.20°
  3. C.120°
  4. D.140°
Show the answer and explanation

Answer: D (140°)

Explanation

A hexagon's angles add to 720°. 120 + 100 + 80 + 150 + 130 = 580, so x = 140°.