In the previous standards, we have seen the following figures in Geography and Science. Such graphs are called pie diagrams.
In a pie diagram, the numerical data is shown in a circle. Different components of a data are shown by proportional sectors of the circle. In figure 6.8, seg OA and seg OB are radii of a circle with centre O.
∠ AOB is the central angle. The shaded region O - AXB is a sector of the circle.
Shaalaa.com | How to Draw a Pie Chart
The following table shows the daily supply of electricity to different places in a town. To show the information by a pie diagram, measures of central angles of sectors are to be decided.
Complete the following activity to find the measure :
Supply of electricity (Thosand units)
|Measure of central angle|
|Roads||4||`4/30 xx 360 = 48^circ`|
|Factories||12||`square/square xx 360=144^circ`|
|shops||6||`6/30xx360 = square`|
Subjectwise marks obtained by a student in an examination are given below
Draw pie diagram
The sales of salesmen in a week are given in the pie diagram. Study the diagram and answer the following questions. If the total sale due to salesmen A is Rs. 18,000, then
a) Find the total sale.
b) Find the sale of each salesman.
c) Find the salesman with the highest sale.
d) Find the difference between the highest sale and the lowest sale.
The following table shows the percentages of vehicles passing a signal. Find out the measures of central angle to show the information by a pie diagram and hence draw the pie diagram.
|Type of Vehicle||Bicycle||Two wheeler||Car||Bus||Rickshaw|
The marks obtained by a student in an examination out of 100 are given below. The total marks obtained in various subjects are as follows:
Represent the above data using pie diagram
|Age group(Yrs)||20 - 25||25 - 30||30 - 35||35 -40|
|No. of persons||80||60||35||25|