# NCERT Book Class 9th Maths Chapter 6 Lines And Angles PDF Download

Class 9th Maths Chapter 6 – Download NCERT Book Lines And Angles Class 9th PDF to your device directly without any ads or redirect.

PDF Name Lines And Angles – NCERT Book Class 9th Maths Chapter 6 14 1.1 MB English PDF PREVIEW

## Introduction to Class 9th Maths Chapter 6

The Class 9th Maths Chapter 6 covers the topic of lines and angles. The chapter begins by introducing the minimum requirements for drawing a line and the axioms used to prove statements about lines and angles. The properties of angles formed by intersecting and parallel lines are explored, including the linear pair axiom and the theorem of vertically opposite angles.

The chapter also covers the concept of parallel lines and how they relate to angles. Finally, Lines And Angles class 9 PDF concludes with a summary of the key points covered and some exercises to reinforce the concepts learned. Overall, the chapter provides a comprehensive understanding of lines and angles and their properties.

## What will you learn from this chapter?

In this Class 9th Maths Chapter 6, we will learn about lines and angles. Specifically, we will study the properties of angles formed when two lines intersect each other, and also the properties of the angles formed when a line intersects two or more parallel lines at distinct points. We will use these properties to prove some statements using deductive reasoning.

The chapter will also cover the concept of parallel lines and how they relate to angles. By the end of the chapter, we will have a thorough understanding of the properties of angles formed by intersecting and parallel lines, and how to use deductive reasoning to prove statements.

### What are the properties of angles formed by intersecting lines?

The properties of angles formed by intersecting lines include the linear pair axiom, which states that if a ray stands on a line, then the sum of the two adjacent angles so formed is 180° and vice-versa. Another property is the theorem of vertically opposite angles, which states that when two lines intersect, the angles opposite each other are equal.

### How do parallel lines relate to angles?

Parallel lines relate to angles in that they form corresponding angles, alternate angles, and interior angles when intersected by a transversal line. These angles have specific properties that can be used to solve problems.

### What is the linear pair axiom?

The linear pair axiom states that if a ray stands on a line, then the sum of the two adjacent angles so formed is 180° and vice-versa.

### How can we use deductive reasoning to prove statements about angles?

Deductive reasoning can be used to prove statements about angles by starting with a set of axioms and using logical steps to arrive at a conclusion.

### What are some real-life applications of the properties of intersecting and parallel lines?

The properties of intersecting and parallel lines have many real-life applications, such as in architecture, engineering, and construction.

### What is the theorem of vertically opposite angles?

The theorem of vertically opposite angles states that when two lines intersect, the angles opposite each other are equal.

### How can we use the properties of angles to solve problems?

The properties of angles can be used to solve problems involving geometric figures, such as finding missing angles or determining the shape of a figure.

### What are some exercises or activities that can help reinforce the concepts covered in this chapter?

Exercises or activities that can help reinforce the concepts covered in this chapter include drawing and labeling angles, identifying corresponding and alternate angles, and solving problems involving intersecting and parallel lines.

### How can we use the concept of parallel lines to find missing angles in a figure?

The concept of parallel lines can be used to find missing angles in a figure by using the properties of corresponding angles, alternate angles, and interior angles.

### What is the difference between acute, obtuse, and right angles?

Acute angles are less than 90 degrees, obtuse angles are greater than 90 degrees, and right angles are exactly 90 degrees.