 # Introduction to Graphs

## 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 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 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)

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 _____

Reference Books for class 8 Math

Given below are the links of some of the reference books for class 8 Math.

1. Mathematics Foundation Course for JEE/Olympiad : Class 8 This book can take students maths skills further. Only buy if child is interested in Olympiad/JEE foundation courses.
2. Mathematics for Class 8 by R S Aggarwal Detailed Mathematics book to clear basics and concepts. I would say it is a must have book for class 8 student.
3. Pearson Foundation Series (IIT -JEE / NEET) Physics, Chemistry, Maths & Biology for Class 8 (Main Books) | PCMB Combo : These set of books could help your child if he aims to get extra knowledge of science and maths. These would be helpful if child wants to prepare for competitive exams like JEE/NEET. Only buy if you can provide help to the child while studying.
4. Reasoning Olympiad Workbook - Class 8 :- Reasoning helps sharpen the mind of child. I would recommend students practicing reasoning even though they are not appearing for Olympiad.

You can use above books for extra knowledge and practicing different questions.

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