Statistical data can be systematically organized and presented in the form of tables, graphs and
charts. One of such charts is a pie chart or diagram. Explain the steps involved in construction
of pie chart ?
Answers
Explanation:
What is a pie chart?
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 observation component is given by -
Value of component / Total value * 360°
If the values of observation/components are expressed in percentage, then the centre angle corresponding to particular observation/component is given by -
Percentage value of component / 100 * 360°
Steps of construction 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 central angles corresponding to the values of respective components.
● Repeat the process for all the components of the given data.
● These radii divide the whole circle into various sectors.
● Now, shade the sectors with different colours to denote various components.
● Thus, we obtain the required pie chart.
Hope this helps.
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