It is a circular graph which is used to
represent data. In this :
Various observations of the data are represented by the
sectors of the circle.
The total angle formed at the centre is 360°.
The whole circle represents the sum of the values of
all the components.
The angle at the centre corresponding to the particular
component is given by
value of the component/total value × 360
If the values of observation/components are expressed
then the centre angle corresponding to particular
observation/component is given by percentage value of component/100 ×360
of pie chart for a given data:
Find the central angle for each component using the
formula given on
the previous page.
Draw a circle of any radius.
Draw a horizontal radius
Starting with the horizontal radius, draw radii, making
corresponding to the values of respective components.
Repeat the process for all the components of the given
These radii divide the whole circle into various
Now, shade the sectors with different colours to denote
Thus, we obtain the required pie chart.