passwella.
Menu

WAEC Mathematics 1997 Question 34

Question 34

Triangles and Quadrilaterals

Two angles of a triangle are 41° and 49°. Which of the following is true? It is

  1. A.an equilateral triangle
  2. B.an isosceles triangle
  3. C.a triangle with an obtuse angle
  4. D.a right-angled triangle
  5. E.a right-angled isosceles triangle.
Show the answer and explanation

Answer: D (a right-angled triangle)

Explanation

The third angle is 180 − 41 − 49 = 90°, and the other two angles differ, so it is right-angled but not isosceles.