Elementary Statistics and Computer Application

Pie diagram

• Pie diagram is a circular diagram. It may be used in place of bar diagrams. It consists of one or more circles which are divided into a number of sectors. In the construction of pie diagram the following steps are involved.
Step 1:

• Whenever one set of actual value or percentage are given, find the corresponding angles in degrees using the following formula
(or)

Step 2:

• Find the radius using the area of the circle π r2 where value of π is 22/7 or 3.14
Example

• Given the cultivable land area in four southern states of India. Construct a pie diagram for the following data.
State	Cultivable area( in hectares)
Andhra Pradesh	663
Karnataka	448
Kerala	290
Tamil Nadu	556
Total	1957

Using the formula,
or
The table value becomes

State	Cultivable area
Andhra Pradesh	121.96
Karnataka	82.41
Kerala	53.35
Tamil Nadu	102.28
Radius = ᴨr²
Here ᴨr² =1957

r2=
r = 24.96
r= 25 (approx)