Question

Draw a pie diagram for the following data of the investment pattern in a five years plan :

Agriculture	Irrigation & Power	Small industries	Transport	Social; Service	Miscellaneous
14%	16%	29%	17%	16%	8%

Answer 1

Here, total investment = 100% 

So, 

The central angle = \(\frac{component\,value}{100}\times360^\circ\)

Hence, 

the central angle for each activity will be calculated as follows

Item	Amount	Sector angle (degree)
Agriculture	14	14/100 x 360 = 50.4
Irrigation and Power	16	16/100 x 360 = 57.6
Small Industries	29	29/100 x 360 = 104.4
Transport	17	17/100 x 360 = 61.2
Social Service	16	16/100 x 360 = 57.6
Miscellaneous	8	8/100 x 360 = 28.8

Steps for construction of representation of data in pie chart 

Step 1: Draw the circle of appropriate radius. 

Step 2 : Choose a radius anywhere inside the circle. 

Step 3 : Now draw a sector of calculated component’s central angle. It is always preferable to choose component with largest central angle first and then continue in descending order of magnitude of their central angle. 

Step 4: After drawing sectors, shade them with different colours and label them as shown in the figure.