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Graphs
Graphs are visual representations of data collected. They often helped us in showing the trend of the data. They are used in various field and it is of immense help to the people. There are many kind of Graph and each of these serve specific purpose.
Various type of Common Graphs
Bar Graph
A
bar graph is used to show comparison among categories
Pie Chart
A circle graph shows the relationship between a whole and its part
Histograms
A Histogram is a bar graph that shows data in intervals. It has adjacent bars over the intervals
line graph
A
line graph displays data that changes continuously over periods of time.
linear graph.
A line graph which is a whole unbroken line is called a
linear graph
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

25^{0}C

26^{0}C

30^{0}C

35^{0}C

40^{0}C

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
Important points
1) The horizontal axis is called Xaxis
2) The vertical axis is called the Yaxis
3) O is the origin
4) Any point is depicted by distance from both the axis
5) The horizontal distance is called the xcoordinate
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)
Test your Knowledge
1) __________________ are visual representations of data collected.
2) A line graph which is a whole unbroken line is called a _____
3) The system of fixing a point with the help of two measurements, vertical and horizontal is known as _________
4) Cartesian system is named in honour of 17th century mathematician ______
5) (0,0) is called _____
Check your Answers
1)Graphs
2)linear graph
3) Cartesian system
4) Rene Descartes
5) Origin
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Class 8 Maths
Class 8 Science