**CBSE Class 9 Maths – MCQ and Online Tests – Unit 6 – Lines and Angles**

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**CBSE Class 9 Maths – MCQ and Online Tests – Unit 6 – Lines and Angles**

Question 1.

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 2.

Each angle of an equilateral triangle is

(a) 50°

(b) 90°

(c) 54°

(d) 60°

## Answer

Answer: (d) 60°

Question 3.

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

(?) 2

(b) 3

(c) 4

(d) 5

## Answer

Answer: (c) 4

Question 4.

In figure, find the value of y.

(a) 28°

(b) 40°

(c) 140°

(d) 56°

## Answer

Answer: (a) 28°

Question 5.

In the given figure, the measure of ?ABC is

(a) 80°

(b) 20°

(c) 100°

(d) 60°

## Answer

Answer: (a) 80°

Question 6.

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

(?) an acute-angled triangle

(b) an obtuse angled triangle

(c) an right angled triangle

(d) an isosceles triangle.

## Answer

Answer: (?) an acute-angled triangle

Question 7.

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

(a) 80°

(b) 100°

(c) 110°

(d) 70°

## Answer

Answer: (a) 80°

Question 8.

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 9.

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 10.

In figure the value of x is

(a) 120°

(b) 130°

(c) 110°

(d) 100°

## Answer

Answer: (b) 130°

Question 11.

In Figure measure of ?ABC is

(a) 60°

(b) 70°

(c) 80°

(d) 50°

## Answer

Answer: (a) 60°

Question 12.

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

(a) 35°

(b) 40°

(c) 60°

(d) 75°

## Answer

Answer: (d) 75°

Question 13.

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 14.

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 15.

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 16.

In ?ABC, 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° + \(\frac{?A}{2}\)

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