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UI Post-UTME Mathematics 2012 Question 5

Question 5

Triangles and Quadrilaterals

Find the third angle of a triangle when x = 60° and if the other two angles are (x + 30°) and (2x − 65°).

  1. A.35°
  2. B.45°
  3. C.55°
  4. D.15°
Show the answer and explanation

Answer: A (35°)

Explanation

The two angles are 90° and 55°, so the third is 180° − 145° = 35°.