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.

Students can also refer to NCERT Solutions for Class 9 Maths Chapter 6 Lines and Angles for better exam preparation and score more marks.

## 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°

## Answer

Answer: (b) 65°

Question 2.

In figure the value of x is

(a) 120°

(b) 130°

(c) 110°

(d) 100°

## Answer

Answer: (b) 130°

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

Answer: (c) 20°, 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

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

## Answer

Answer: (c) 4

Question 6.

In the given figure, the measure of ∠ABC is

(a) 80°

(b) 20°

(c) 100°

(d) 60°

## Answer

Answer: (a) 80°

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

Answer: (а) an acute-angled triangle

Question 8.

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

(a) 80°

(b) 100°

(c) 110°

(d) 70°

## Answer

Answer: (a) 80°

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

## Answer

Answer: (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°

## Answer

Answer: (c) 70°

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

Answer: (b) 52 \(\frac{1°}{2}\)

Question 12.

In Figure measure of ∠ABC is

(a) 60°

(b) 70°

(c) 80°

(d) 50°

## Answer

Answer: (a) 60°

Question 13.

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

(a) 35°

(b) 40°

(c) 60°

(d) 75°

## Answer

Answer: (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°

## Answer

Answer: (c) 80°

Question 15.

Each angle of an equilateral triangle is

(a) 50°

(b) 90°

(c) 54°

(d) 60°

## Answer

Answer: (d) 60°

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

Answer: (b) 140°

Question 17.

In figure, find the value of y.

(a) 28°

(b) 40°

(c) 140°

(d) 56°

## Answer

Answer: (a) 28°

Question 18.

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

(a) 80°

(b) 70°

(c) 60°

(d) 20°

## Answer

Answer: (a) 80°

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