## Chapter 7 Triangles

Chapter 7.TrianglesDefinition:- a closed figure formed by three intersecting lines is called a triangle. (‘Tri’ means ‘three’). A triangle has three sides, three angles and three vertices. For example, in … Read More

## chapter 6 lines and Angles

Chapter 6.Lines and Angles Basic Terms and Definitions I.a part (or portion) of a line with two end points is called a line-segment and a part of a line with … Read More

## Chapter 5. INTRODUCTION TO EUCLID’S GEOMETRY

1. The word ‘geometry’ comes form the Greek words ‘geo’, meaning the ‘earth’, and ‘metrein’, meaning ‘to measure’. Geometry appears to have originated from the need for measuring land. 2. … Read More

## Chapter 4.Linear Equations in Two variables

1. An equation of the form ax + by + c = 0, where a, b and c are real numbers, such that a and b are not both zero, … Read More

## Chapter 3.Coordinate Geometry

Important Points to Remember 1. What are the coordinates of the origin O? It has zero distance from both the axes so that its abscissa and ordinate are both zero. … Read More

## 1.Number System

Class IX(Chapter 1.Numbers System) 1.Natural Number (N) : All number s  used in counting are known as natural numbers such  as 1,2,3,….., is called natural number.Denoted by N.N={1,2,3,……,n}. 2.Whole Number(W): … Read More