Table of contents 
Introduction 
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Learning Objectives
Pie charts are specific types of data presentation where the data is represented in the form of a circle. In a pie chart, a circle is divided into various sections or segments such that each sector or segment represents a certain proportion or percentage of the total. In such a diagram, the total of all the given items is equated to 360 degrees and the degrees of angles, representing different items, are calculated proportionately. The entire diagram looks like a pie and its components resemble slices cut from a pie. The pie chart is used to show the breakup of one continuous variable into its component parts.
There are two approaches to constructing a pie chart from any given data
(A) Degree Approach: The central angle in a circle represents 360^{o}, so any part or segment in a pie chart is calculated as a proportion of 360^{o}.
(B) Percentage Approach: In this case, any part or segment in a pie chart is calculated as a part of 100%.
Conversion of degree approach to percentage approach:
If we convert the same pie chart into the degree format, we will be required to do the following conversions:
Total = 100%
Hence, 1% = 3.6^{o}
Central = 10% = 36^{o}
North = 20% = 72^{o}
South = 25% = 90^{o}
East = 15% = 54^{o}
West =30% = 108^{o}
Significance of Pie Charts
The pie chart has gained prominence due to the following reasons:
Example: Following is the cost analysis of a book “Guide to Digital Marketing”.
What is the central angle showing the cost of paper?
(a) 42.8^{o}
(b) 32.6^{o}
(c) 36.8^{o}
(d) 57.6^{o}
Solution: Percentage of paper cost in total cost  16%
We know that the sum of angles in pie chart is 100^{o}
Hence, Required Angle = (16/100 × 360) = 57.6^{o}
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