## Construction of Triangles – Class VIII

Introduction to Construction of Triangles  there are six elements associated with it, namely, three  sides  and three angles. Do we need all of these to create a triangle? If we are known, it is well and good. In variety of practical situations, we may not know all these. If we know only two, we cannot construct … Continue reading Construction of Triangles – Class VIII

## Congruency of Triangles – Class VIII

Congruency is one of the fundamental concepts in geometry. This concept is used to classify the geometrical figures on the basis of their shapes. Two geometrical figures are said to be congruent, if they have same shape and size. For example: Two line segments are congruent if they have  same length. Two angles are congruent… Continue reading Congruency of Triangles – Class VIII

## Theorems on Triangles – Full chapter – Class VIII

A plane figure bounded by three non concurrent line segment in plane is called a TRIANGLE. Clearly, when we say a plane figure, we actually mean the linear figure, not the two dimensional figure. Let A, B, C are non linear points such that they are not on the same line; we say A, B,… Continue reading Theorems on Triangles – Full chapter – Class VIII

## Axioms, Postulates and Theorems – Class VIII

Axioms: There are certain elementary statements, which are self evident and which are accepted without any questions. These are called axioms. Axiom 1: Things which are equal to the same thing are equal to one another. For example: Draw a line segment AB of length 10cm. Draw a second line CD having length equal to… Continue reading Axioms, Postulates and Theorems – Class VIII

## Factorization – Full Chapter – Class VIII

Factorization is exactly opposite of multiplication. In multiplication we multiply two or more terms or numbers to get one term or number. Examples for multiplication are given below: Ex1: 3*3=9 Ex2: 2a*a=2a2 The Process of writing an algebraic expression as a product of two or more expressions is called factorization. We know that, FACTORIZATION is… Continue reading Factorization – Full Chapter – Class VIII

## Algebraic Expressions – Full Chapter – Class VIII

Let us recall what we have studied in earlier classes about algebraic expressions. Constant: A symbol which has a fixed value. ex: 5,-8,√6,2+√3 and etc. Variable: A symbol which does not have any fixed value but may be assigned value according to the requirements. ex: p,q,x,y etc. Term: A number , a variable or a… Continue reading Algebraic Expressions – Full Chapter – Class VIII

## Linear Equations in One Variable – Class VIII

Equation:  In mathematics we use the symbol "=" to show that quantities are equal to each other. Therefore, linear equations are those algebraic expression with the symbol =. Ex: x+3=8 The standard form of an equation is a statement that an algebraic expression is equal to 0. Ex: x-3=0 The statement need not to be… Continue reading Linear Equations in One Variable – Class VIII

## Introduction to Graphs – Full Chapter – Class VIII

2.5.1 Introduction to Graphs: In May, when summer is at its peak. We may find some days are too hot and some days are not so hot. We may measure the maximum temperature on each day. We get data of the whole month. Perhaps we will tabulate it straight forward way in order to learn… Continue reading Introduction to Graphs – Full Chapter – Class VIII

## Statistics – Full Chapter with Exercise – Class VIII

In  this chapter let us study  little more about statistics. A collection of numerical facts with particular information is called data. Consider, the marks obtained by 20 students in mathematics in 8th standard mid-term examination: 56, 31, 44, 78, 67, 74, 38, 60, 56, 59, 87, 73, 38, 77, 84, 80, 49, 60, 60, 71… Continue reading Statistics – Full Chapter with Exercise – Class VIII

Mathematics

## Commercial Arithmetic – ch.1 unit 4 – Class VIII

In this let us study several aspects of commercial Mathematics which are useful in our daily life. 1.4.2 Percentage We are so familiar with the meaning of percentage. Per cent means for every hundred. Thus, 4 percent means 4 for every hundred or  4/100 . Percentage is also a fraction whose denominator is 100. the… Continue reading Commercial Arithmetic – ch.1 unit 4 – Class VIII