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Introduction to Graphs




Table Of content
  • Graphs
  • Various type of Common Graphs
  • Solved Examples on Graphs
  • Cartesian system

  • 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
     
    Introduction to Graphs :Bar Graph
     

    Pie Chart

    A circle graph shows the relationship between a whole and its part
     
    Introduction to Graphs: Pie Chart
     
     

    Histograms

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

    line graph

     
    A line graph displays data that changes continuously over periods of time.
     
    Introduction to Graphs:Line Graph
     

    linear graph.

     
    A line graph which is a whole unbroken line is called a linear graph
    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)
    Example of Line Graph of Class 8 Maths Introduction to Graph chapter
    b)
    Example of Line Graph

    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: 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
    Example of Cartesian system
    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 _____

     

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    Also Read





    Class 8 Maths Class 8 Science
    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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