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Introduction to Graphs


Graphs

Graphs are visual representations of data collected. They often helped us in showing the trend of the data
 

Various type of Common Graphs

Bar Graph

A bar graph is used to show comparison among categories
 
Introduction to Graphs notes Class 8 maths CBSE
 

Pie Chart

A circle graph shows the relationship between a whole and its part
 
Introduction to Graphs notes Class 8 maths CBSE
 
 

Histograms

A Histogram is a bar graph that shows data in intervals. It has adjacent bars over the intervals
 
Description: Histogram
 

line graph

 
A line graph displays data that changes continuously over periods of time.
 
Introduction to Graphs notes Class 8 maths CBSE
 

linear graph.

 
A line graph which is a whole unbroken line is called a linear graph
Introduction to Graphs notes Class 8 maths CBSE
 
 

Solved Examples on Graphs

 
Draw the Line Graph for the following
a)
Sales (crore)
10
15
20
15
25
Year
2013
2014
2015
2016
2017
 
b)
 
Time
10
11
12
13
14
Temperature
250C
260C
300C
350C
400C
 
Solution
a)

b)

Cartesian system

The system of fixing a point with the help of two measurements, vertical and horizontal is known as Cartesian system
 
 
Introduction to Graphs notes Class 8 maths CBSE: Cartesian system
 
Important points
1) The horizontal axis is called X-axis
2) The vertical axis is called the Y-axis
3) O is the origin
4) Any point is depicted by distance from both the axis
5) The horizontal distance is called the x-coordinate
6) The vertical distance is called the y -coordinate
Example

Find the coordinates of the each of the point in the given below figure
Solution
A( 4,5)
B(5,0)
C(3,3)
D( 1,2)
E(2,1)
F(5.5,0)
G( 2,0)
 

 

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