The document explains the concept and construction of circle graphs, also known as pie charts, which visually represent data by dividing a circle into sectors. It outlines the properties of circle graphs and provides step-by-step instructions for plotting them, including determining suitability, calculating percentages, drawing the graph, and labeling it. An example using energy sources in towns illustrates the application of these concepts.

1. Handling Data
CIRCLE GRAPHS
MADE BY
ANANYA JAIN

2. Data Analysis using Graphs
Graphs are a common method that can
visually illustrate the relationships in the
data. The purpose of a graph is to provide
too much or too complex data to be
adequately described in the text with less
space . There are 3 types of graphs –
1. Circle Graphs
2. Bar Graphs
3. Line Graphs

3. Circle Graphs
As you know in the
last slide we learnt
about different
types of graphs,
and today we are
going to learn
about circle graphs
which are also
known as pie
charts.

4. What is a circle graph?
A circle graph or a pie chart is a visual representation of data, made by
dividing a circle into sectors that each represent parts of a whole.

5. Properties of a Circle Graph
The properties of a circle graph are:
1. They are circular shaped with the entire circle representing the
whole.
2. The circle is then split into parts or sectors.
3. Each sector represent a part of a whole.
4. Each sector is proportional in size to the amount each sector
represents therefore its easy to make generalizations and
comparison.

6. How to Plot Circle Graph
The following steps are to plot a circle graph.
Step 1: To check suitability
Determine if there is a whole for the data. Then determine what are
different parts or data groups of the whole are
Step 2: Calculate Percentage
Convert the amount of each part or data group size into a fraction of a
whole

7. Continued……
Step 3: Draw the graph
Draw a circle and draw in a part (using a protractor) for each group
Step 4: Title and label the graph
Label the parts with the data group name and , percentage or
fraction . Then add a title to the graph.

8. Example
Energy Source Number of towns
Coal 12 towns
Oil 6 towns
Solar 3 towns
Wind 3 towns
Total 24 towns

9. Constructing the Circle Graph
Step 1: Is the data suitable
• There are four parts to the whole . Each data group is a category of
energy source (1)Coal , (2)Oil , (3)Solar and (4)Wind.
Step 2: Calculate Fraction
• Calculate the Whole: 12 + 6 + 3 +3 = 24
Calculate the fraction for each part
Ex – Coal:
12
24
=
1
2
of 100 = 50

10. Continued
Step 3: Draw the graph
• First, draw a circle. Then, draw in the sectors of the circle using a
protractor to calculate the size of the sector.
• The fraction has to be converted to degrees
Ex –
1
2
of 360o =180o
Step 4: Title and label the graph

11. The Graph
Now you can see the graph below , depicts the proper display of data ,
from the table shown earlier .
50
25
12.5
12.5
Sources of Energy in India
Coal 12 towns Oil 6 towns Solar 3 towns Wind 3 towns