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WAEC Mathematics 2011 Question 18

Question 18

Constructions

Which of these angles can be constructed using ruler and a pair of compasses only?

  1. A.115°
  2. B.125°
  3. C.135°
  4. D.145°
Show the answer and explanation

Answer: C (135°)

Explanation

135° = 90° + 45°, and both 90° and 45° can be constructed by drawing perpendiculars and bisecting.