[Maths Class Notes] on Introduction to Graphs Pdf for Exam

Significance of Introduction to Graphs

The mathematics chapter of Introduction to Graphs helps you understand and study the graphical representation of data. The various arrangements of data for the purpose of comparison, analysis, or representation are made using these graphs.

You will be able to learn this Introduction to Graphs Class 8 chapter quickly with the help of our notes. Go through them attentively and make sure you familiarise yourself with the nuances of this chapter. This will eventually help in your academics and understanding or representing a large set of data using graphs.

Introduction to Graphs in Maths

To elaborate this concept, here large volume of numerical data is represented in graphical or pictorial format for the ease of understanding. A graph can have multiple applications such as the comparison between categories, observing the change over a period, data in short intervals, etc.

For any of the applications, the Introduction of Graph Theory discusses several kinds of methods or graphical or pictorial representation of data. A few of them are mentioned below.

1. Bar graphs

As discussed in Class 8 Introduction to Graphs, bar graphs use bars of an identical width to represent the proportion of various quantities or categories. It is widely used for comparison.

Below represents a bar graph which shows profits earned by a company in different years.

Bar graphs can also be used to indicate more than one type of data and then compare and analyse them. An introduction to graph theory west chapter also discusses double bar graphs. Refer to the image below to understand double bar graphs. It represents the maximum temperature rise in four different seasons in two different years (1950 and 2000).

1. Histograms

As per NCERT Class 8 Introduction to Graphs, histograms are similar to bar graphs even though they are a continuous representation of data. Here, the data is grouped in regular intervals but continuous forms. For instance, the histogram shown below represents the distribution or frequency of people in a city as per their age.

1. Pie Charts

In Class 8 Maths Introduction to Graphs, a pie graph is described as a circular representation of the entire data. It is used for cases when a few portions of a whole needs to be represented.

For instance, this pie chart indicates what percentage of people like to watch which genre movie. From the pie chart, it is clear that 30% of people like to watch movies from the romantic genre.

1. Linear and Line Graphs

A line graph is the one where data points vary with the change in time. And as per NCERT Class 8 Maths Introduction to Graphs chapter, linear graphs are the one wherein all the points draw into a straight line.

For instance, observing the change in data over a period can be best observed with a line graph, as shown below.

Further, a linear graph has data which forms into a straight line and has two variables in the two axes.

Since you are familiar with CBSE Class 8 Maths Introduction to Graphs concepts, you will be able to solve the exercise questions with ease. For more comprehensive learning, you can download our app and start learning. The study notes and Introduction to Graphs Class 8 questions prepared meticulously by our expert tutors will surely help you clear exams with flying colours.