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# NCERT Solutions For Class 9 Maths Chapter 6 Exercise 6.1 Lines and Angles - PDF Download

Class 9

NCERT solutions for class 9 maths chapter 6 ex 6.1 Lines and Angles provides an overview of the fundamental concepts and definitions associated with lines and angles, intersecting lines and non - intersecting lines, pairs of angles, theorems and their properties. By practicing questions of ex 6.1, students will be able to gain a comprehensive understanding of these fundamental concepts.

Class 9 maths chapter 6 exercise 6.1 ncert solutions will provide the students with the necessary instruction to differentiate between line segments, ray, parallel line, perpendicular line, angles, right angle, and associated concepts and theorem. NCERT solutions class 9 maths chapter 6 ex 6.1 consists of 6 questions where you have to prove a particular condition according to the properties of the lines and angles. You can practice all the questions of ex 6.1 that are available in PDF format. You can also learn these concepts by downloading the free PDF of NCERT solutions from the eSaral website.

## Topics Covered in Exercise 6.1 class 9 Mathematics Questions

Ex 6.1 class 9 maths solutions covers topics based on lines and angles, intersecting and non-intersecting lines, pair of angles etc. You will learn these concepts in detail which are provided below.

 1 Basic Terms and Definitions 2 Intersecting Lines and Non - intersecting Lines 3 Pair of Angles 4 Theorem 6.1
1. Basic Terms and Definitions

• Point - A point that does not contain any elements. It is denoted by a dot.

• Lines - When two different points are connected, a line is formed. A line does not have any finite length and can be extended infinitely.

• Line Segment -  It is the part of the line which has two endpoints.

• Ray - Ray is also part of the line that only has one endpoint and there's no end at the otherside.

• Collinear and Non-collinear points - If two or more points are on the same line, they're called collinear points. If they're not, they're called non-collinear points.

Type of Angles

1. Acute Angle - An angle measures between 0° and 90°.

2. Right Angle - An angle measures exactly equal to 90°.

3. Obtuse angle - An angle greater than 90° but less than 180°.

4. straight angle - An angle which is exactly equal to 180°.

5. Reflex angle - An angle which is greater than 180° but less than 360°

6. Complementary angles - Two angles whose sum is 90° are called complementary angles.

7. Supplementary angles - Two angles whose sum is 180° are called supplementary angles.

Relation between two Angles

Adjacent Angles - If two angles have a common vertex, a common arm and their non-common arms are on different sides of the common arm, it is called adjacent angle.

Linear Pair of Angles - If two angles share a common vertex and a common arm, but the non-common arms form a line, then these are referred to as linear pairs of angles.

Vertically Opposite Angles - If two lines intersect at a point, then the opposite angles are called vertically opposite angles.

2. Intersecting Lines and Non - intersecting Lines - Intersecting lines are the lines that intersect each other from a specific point. Non-intersecting lines are lines that don't intersect each other. They're called Parallel lines, and the common length between two lines is the distance between parallel lines.

3. Pair of Angles

Axiom 1 - If a ray stands on a line, then the sum of two adjacent angles so formed is 180°.

Axiom 2 - If the sum of two adjacent angles is 180°, then the non-common arms of the angles form a line.

4. Theorem 6.1 - If two lines intersect each other, then the vertically opposite angles are equal.

## Tips for Solving Exercise 6.1 class 9 chapter 6 Lines and Angles

In ex 6.1 class 9 maths chapter 6 NCERT solutions, students will learn some important tips on how to solve questions related to lines and angles.

1. Practicing the questions in NCERT solutions class 9 maths chapter 6 ex 6.1 on a regular basis will help you get the basics of lines and angles. Most of the questions in this exercise revolve around the core concept of lines and angles, so it's important to clarify all the doubts and understand all the concepts before solving the questions.

2. Exploring the examples and comprehending the theorems and concepts presented in these solutions will enable students to develop a fundamental understanding of the questions included in ex 6.1.

3. NCERT solutions also provide ways to easily memorize the terms, definitions, theorems and properties associated with lines and angles.

## Importance of Solving Ex 6.1 class 9 Maths chapter 6 Lines and Angles

Using NCERT solutions to solve ex.6.1 questions has a lot of benefits.

1. Using the solutions provided by the academic team of mathematics, you will be able to gain a better understanding of the different concepts of lines and angles.

2. A comprehensive analysis of the complex questions from each part of the exercise is included in these solutions.

3. Class 9 Maths exercise 6.1 provides an introduction to parallel lines and the concept of pairs of angles.

1. These solutions are error-free and thus enable students to gain a thorough understanding of ex 6.1.

Question 1. What are collinear points and non-collinear points?

Answer 1. If two or more points are on the same line, they're called collinear points. If they're not, they're called non-collinear points.

Question 2. What are the various types of angles?

Answer 2. There are various types of angles.

1. Acute angle

2. Right angle

3. Obtuse angle

4. Straight angle

5. Reflex angle

Question 3. What is a linear pair of angles?

Answer 3. If two angles share a common vertex and a common arm, but the non-common arms form a line, then these are referred to as linear pairs of angles.