Check the below NCERT MCQ Questions for Class 9 Maths Chapter 6 Lines and Angles with Answers Pdf free download. MCQ Questions for Class 9 Maths with Answers were prepared based on the latest exam pattern. We have provided Lines and Angles Class 10 Maths MCQs Questions with Answers to help students understand the concept very well.

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## Lines and Angles Class 9 MCQs Questions with Answers

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°

Question 2.
In figure the value of x is (a) 120°
(b) 130°
(c) 110°
(d) 100°

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°

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° + $$\frac{∠A}{2}$$
(c) 180 – ∠A
(d) 90° – $$\frac{∠A}{2}$$

Answer: (b) 90° + $$\frac{∠A}{2}$$

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) 5

Question 6.
In the given figure, the measure of ∠ABC is (a) 80°
(b) 20°
(c) 100°
(d) 60°

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.

Question 8.
In figure l1 || l2, the value of x is (a) 80°
(b) 100°
(c) 110°
(d) 70°

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 triangle

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°

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 $$\frac{1°}{2}$$
(b) 52 $$\frac{1°}{2}$$
(c) 72 $$\frac{1°}{2}$$
(d) 75°

Answer: (b) 52 $$\frac{1°}{2}$$

Question 12.
In Figure measure of ∠ABC is (a) 60°
(b) 70°
(c) 80°
(d) 50°

Question 13.
In Figure AB || CD, the value of x is (a) 35°
(b) 40°
(c) 60°
(d) 75°

Question 14.
In the figure, PS ⊥ l, RQ ⊥ l, the degree measure of y is (a) 55°
(b) 90°
(c) 80°
(d) 135°

Question 15.
Each angle of an equilateral triangle is
(a) 50°
(b) 90°
(c) 54°
(d) 60°

Question 16.
Given lines l1 || l2 and l2 || l3 in figure. The value of x is (a) 40°
(b) 140°
(c) 50°
(d) 80°

Question 17.
In figure, find the value of y. (a) 28°
(b) 40°
(c) 140°
(d) 56°

Question 18.
In the given figure, if AOB is a straight line, then ∠BOC is (a) 80°
(b) 70°
(c) 60°
(d) 20°