CBSE  /  Class 9  /  Maths  /  Lines and Angles

  • 1. 
    In ΔABC, ∠A = 50° and the external bisectors of ∠B and ∠C meet at O as shown in figure. The measure of ∠BOC is
    MCQ Questions for Class 9 Maths Chapter 6 Lines and Angles with Answers 1

  • 40°
  • 65°
  • 115°
  • 140°

  • 2. 
    In figure the value of x is
    MCQ Questions for Class 9 Maths Chapter 6 Lines and Angles with Answers 2

  • 120°
  • 130°
  • 110°
  • 100°

  • 3. 
    An exterior angle of a triangle is 80° and the interior opposite angles are in the ratio 1 : 3, measure of interior opposite angles are

  • 30°, 90°
  • 40°, 120°
  • 20°, 60°
  • 30°, 60°

  • 4. 
    In ΔABC, the bisectors of ∠ABC and ∠BCA intersect each other at O. The measure of ∠BOC is

  • 90° + ∠A
  • 90° + \(\frac{∠A}{2}\)
  • 180 - ∠A
  • 90° - \(\frac{∠A}{2}\)

  • 5. 
    In figure if ∠A + ∠B + ∠C + ∠D + ∠E + ∠F = k right angles, then find value of k.
    MCQ Questions for Class 9 Maths Chapter 6 Lines and Angles with Answers 3

  • 2
  • 3
  • 4
  • 5

  • 6. 
    In the given figure, the measure of ∠ABC is
    MCQ Questions for Class 9 Maths Chapter 6 Lines and Angles with Answers 4

  • 80°
  • 20°
  • 100°
  • 60°

  • 7. 
    The angle of a triangle are in the ratio 5 : 3 : 7, the triangle is

  • an acute-angled triangle
  • an obtuse angled triangle
  • an right angled triangle
  • an isosceles triangle.

  • 8. 
    In figure l1 || l2, the value of x is
    MCQ Questions for Class 9 Maths Chapter 6 Lines and Angles with Answers 5

  • 80°
  • 100°
  • 110°
  • 70°

  • 9. 
    If one angle of triangle is equal to the sum of the other two, then the triangle is

  • an isosceles triangle
  • an obtuse-angled triangle
  • an equilateral triangle
  • a right triangle

  • 10. 
    One of the angles of a triangle is 75°. If the difference of other two is 35°, then the largest angle of other two angles has a measure

  • 80°
  • 75°
  • 70°
  • 135°
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