class 8 maths ( introduction to graphs) mind map
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Revision Notes on Introduction to Graphs
Graph
The graphs are the visual representation of the data collected in numerical form so that it could be easily understood. Graphs are generally used for comparisons between two or more data.
Types of Graph
1. Bar Graph
A bar graph is a type of graph which is used to show comparisons between different categories. In this type of graph, bars of uniform width are used to represent the different quantities and their height is proportional to their respective values.

This is the bar graph which shows the profit of the company over different years.
2. Double Bar Graph
This is the same as the bar graph but two types of data are shown here simultaneously. Generally, this type of graph is used to show a comparison between two data.

This Double bar graph shows the average temperature in different seasons in two different years. Green bars show the temperature in 1950 and pink bars show the temperature in 2000. Hence we can easily compare the up and downs in average temperature from 1950 to 2000.
3. A Pie Chart (Circle Graph)
When we represent the given data in the circular form then it is said to be a pie chart. It shows the part of a whole.

This pie chart shows the percentage of people watching different kind of movies. From this chart, we can easily get that the maximum number of people like romantic movies and the least number of people like drama movies.