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WAEC Mathematics 2007 Question 19

Question 19

Triangles and Quadrilaterals

From the diagram, find the value of x.

Diagram for this question
  1. A.80°
  2. B.70°
  3. C.55°
  4. D.35°
Show the answer and explanation

Answer: A (80°)

Explanation

The slanting lines are parallel and the horizontal lines are parallel. The 100° angle and the angle between the slanting line and the horizontal going right are on a straight line, so that angle is 80°, and x equals it (corresponding angles).