# NCERT Solutions for Class 9 Maths Chapter 6

NCERT Solutions for Class 9 Maths Chapter 6 Lines and Angles Exercise 6.1, Exercise 6.2 and Exercise 6.3 in English Medium as well as Hindi Medium updated for new academic session 2020-2021 based on latest NCERT Books.

Download प्रश्नावली 6.1, प्रश्नावली 6.2 and प्रश्नावली 6.3 of रेखाएँ और कोण in Hindi Medium free to download in PDF updated for academic year 2020-21. All the NCERT Solutions 2020-2021 can be viewed in Video Format also for CBSE Board, MP Board, Gujrat, Board, UP Board and other board following NCERT Books in the academic session 2020-21 onward.## NCERT Solutions for Class 9 Maths Chapter 6

Class: | 9 |

Subject: | Maths – गणित |

Chapter 6: | Lines and Angles |

### 9th Maths Chapter 6 Solutions in English & Hindi Medium

NCERT Solutions for class 9 Maths Chapter 6 Exercise 6.1, 6.2 and 6.3 Lines and angles in English Medium as well as Hindi Medium in PDF form as well as study online options are given for academic session 2020-21. Ask your doubts and reply to other users through Discussion Forum. A platform to share your knowledge.

### 9th Maths Exercise 6.1 Solutions

### 9th Maths Exercise 6.2 Solutions

### 9th Maths Exercise 6.3 Solutions

### Study Material

##### What are Intersecting lines?

Intersecting lines: Two lines are said to be intersecting, if they intersect each other at one point.

##### What is meant by Parallel lines?

Parallel lines: Lines in the same plane which do not intersect when produced on either side.

##### What do you know about Transversal lines?

Transversal lines: It is a straight line which cuts two or more straight lines at distinct point.

##### What is an Acute angle?

Acute angle: An angle whose measure is less than 90 but more than 0.

##### What do you understand by an Obtuse angle?

Obtuse angle: An angle whose measure is more than 90 but less than 180.

##### What is a Right angle?

Right angle: An angle whose measure is 90.

##### What is the measure of a Straight angle?

Straight angle: The measure of a straight angle is 180.

##### What is Reflex angl?

Reflex angle: An angle whose measure is more than 180 but less than 360.

##### Which angle is called Complete angle?

Complete angle: An angle whose measure is 360.

##### What are Complementary angles?

Complementary angles: Two angles are said to be complementary, if the sum of their measure is 90.

##### What are Supplementary angles?

Supplementary angles: Two angles are said to be supplementary, if the sum of their measure is 180.

##### What are Adjacent angles?

Adjacent angles: Two angles are called adjacent angles, if they have a common vertex and common arm.

##### What do you know about Vertically opposite angles?

Vertically opposite angles: Two angles are said to be a pair of vertically opposite angles, if their arms from two pairs of opposite rays.

#### Important Notes on 9th Maths Chapter 6

If a transversal intersects two parallel lines, then

1. Each of the alternate interior angles is equal. (Converse is also true).

2. Each pair of interior angles on the same side of the transversal is supplementary. (Converse is also true).

3. Each pair of corresponding angles is equal.

### Important Questions on 9th Maths Chapter 6

(ii) each pair of alternate interior angles is equal,

(iii) each pair of interior angles on the same side of the transversal is supplementary.