# 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. UP Board Solutions for Class 9 Maths Chapter 6 Prashnavali 6.1, Prashnavali 6.2 and Prashnavali 6.3 of Rekhaen aur Kon in Hindi Medium are given below to free download in PDF file format. All the question answers are updated for academic year 2020-21. 9th Maths Solutions for Chapter 6 are compatible for UP Board and CBSE Board Students. The NCERT Solutions 2020-2021 can be used in Video format by all the Boards like CBSE Board, MP Board, Gujrat, Board, UP Board and other board following NCERT Books in the academic session 2020-21 onward.

Chapter 6 of 9th Mathematics includes the concepts of Lines and Angles. It is the first chapter in Geometry in class 9 Maths, which takes time to understand the concepts.

## NCERT Solutions for Class 9 Maths Chapter 6

 Class: 9 Maths (English and Hindi Medium) 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. UP Board or CBSE Board or other boards students can ask their doubts and reply to other users through Tiwari Academy Discussion Forum. A platform to share your knowledge.

• ### Study Material for Class 9 Maths

#### Class 9 Maths Exercise 6.1 Question 1, 2, 3, 4 Solutions in Video

Class 9 Maths Exercise 6.1 Question 1, 2 in Video
Class 9 Maths Exercise 6.1 Question 3, 4 in Video

#### Class 9 Maths Exercise 6.1 Question 5, 6 Solutions in Video

Class 9 Maths Exercise 6.1 Question 5, 6 in Video
Class 9 Maths Exercise 6.1 Solutions in Video

#### Class 9 Maths Exercise 6.2 Question 1, 2, 3, 4 Solutions in Video

Class 9 Maths Exercise 6.2 Question 1, 2 in Video
Class 9 Maths Exercise 6.2 Question 3, 4 in Video

#### Class 9 Maths Exercise 6.2 Question 5, 6 Solutions in Video

Class 9 Maths Exercise 6.2 Question 5, 6 in Video
Class 9 Maths Exercise 6.2 Solutions in Video

#### Class 9 Maths Exercise 6.3 Question 1, 2, 3, 4 Solutions in Video

Class 9 Maths Exercise 6.3 Question 1, 2 in Video
Class 9 Maths Exercise 6.3 Question 3, 4 in Video

#### Class 9 Maths Exercise 6.3 Question 5, 6 Solutions in Video

Class 9 Maths Exercise 6.3 Question 5, 6 in Video
Class 9 Maths Exercise 6.3 Solutions in Video
##### 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.

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

• Each of the alternate interior angles is equal. (Converse is also true).
• Each pair of interior angles on the same side of the transversal is supplementary. (Converse is also true).
• Each pair of corresponding angles is equal.

### Important Questions on 9th Maths Chapter 6

What is a line-segment?
A part (or portion) of a line with two end points is called a line-segment.
What is a ray?
A part of a line with one end point is called a ray.
What do you mean by collinear points or non-collinear points?
If three or more points lie on the same line, they are called collinear points; otherwise they are called non-collinear points.
What are the different types of angle?
An acute angle measures between 0° and 90°, whereas a right angle is exactly equal to 90°. An angle greater than 90° but less than 180° is called an obtuse angle. A straight angle is equal to 180°. An angle which is greater than 180° but less than 360° is called a reflex angle. Further, two angles whose sum is 90° are called complementary angles, and two angles whose sum is 180° are called supplementary angles.
What happens If a transversal intersects two parallel lines?
(i) each pair of corresponding angles is equal,
(ii) each pair of alternate interior angles is equal,
(iii) each pair of interior angles on the same side of the transversal is supplementary.
What is the sum of the three angles of a triangle?
The sum of the three angles of a triangle is 180°.            