charts are graphical forms of data presentation where the data is
illustrated in the form of a circle, which is further divided into
diverse sections or segments such that each sector or segment
represents a certain percentage or proportion of the total. The
pie chart encloses a circle of 360 degrees which represents 100 per
cent of the value of the continuous variable. Thus, 3.6
degrees on the pie chart represent 1 percent of the total value of
the continuous variable being represented. The entire diagram looks
like a pie and its components resemble slices cut from a pie.
single pie diagram can represent only one continuous variable. Hence,
in terms of versatility of data representation, pie charts are less
versatile than either of bar charts, x-y graphs or tables. However,
their utility is in the fact that the representation of data is
cleaner and it gives an immediate idea of the relative distribution
of the continuous variable amongst different sectors.