## CBSE Class 9 Lines and Angles MCQ By Clarify Knowledge

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## CBSE Class 9 Lines and Angles MCQ Table

Question 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

(a) 40°

(b) 65°

(c) 115°

(d) 140°Answer

Question 2.

In figure the value of x is

(a) 120°

(b) 130°

(c) 110°

(d) 100°Answer

Question 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

(a) 30°, 90°

(b) 40°, 120°

(c) 20°, 60°

(d) 30°, 60°Answer

Question 4.

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

(a) 90° + ∠A

(b) 90° + ∠A2

(c) 180 – ∠A

(d) 90° – ∠A2Answer

Question 5.

In figure if ∠A + ∠B + ∠C + ∠D + ∠E + ∠F = k right angles, then find value of k.

(а) 2

(b) 3

(c) 4

(d) 5Answer

Question 6.

In the given figure, the measure of ∠ABC is

(a) 80°

(b) 20°

(c) 100°

(d) 60°Answer

Question 7.

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

(а) an acute-angled triangle

(b) an obtuse angled triangle

(c) an right angled triangle

(d) an isosceles triangle.Answer

Question 8.

In figure l_{1} || l_{2}, the value of x is

(a) 80°

(b) 100°

(c) 110°

(d) 70°Answer

Question 9.

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

(a) an isosceles triangle

(b) an obtuse-angled triangle

(c) an equilateral triangle

(d) a right triangleAnswer

Question 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

(a) 80°

(b) 75°

(c) 70°

(d) 135°Answer

Question 11.

An exterior angle of a triangle is 105° and its two interior opposite angles are equal. Each of these equal angles is

(a) 37 1°2

(b) 52 1°2

(c) 72 1°2

(d) 75°Answer

Question 12.

In Figure measure of ∠ABC is

(a) 60°

(b) 70°

(c) 80°

(d) 50°Answer

Question 13.

In Figure AB || CD, the value of x is

(a) 35°

(b) 40°

(c) 60°

(d) 75°Answer

Question 14.

In the figure, PS ⊥ l, RQ ⊥ l, the degree measure of y is

(a) 55°

(b) 90°

(c) 80°

(d) 135°Answer

Question 15.

Each angle of an equilateral triangle is

(a) 50°

(b) 90°

(c) 54°

(d) 60°Answer

Question 16.

Given lines l_{1} || l_{2} and l_{2} || l_{3} in figure. The value of x is

(a) 40°

(b) 140°

(c) 50°

(d) 80°Answer

Question 17.

In figure, find the value of y.

(a) 28°

(b) 40°

(c) 140°

(d) 56°Answer

Question 18.

In the given figure, if AOB is a straight line, then ∠BOC is

(a) 80°

(b) 70°

(c) 60°

(d) 20°Answer