The following table shows how a student spends his pocket money during the course of a month. Represent it by a pie diagram.


Items



Food



Entertainment



Other Expenditure



Savings



Expenditure



40%



25%



20%



15%


Here, total expenditure = 100 %


So,


The central angle = × 360°


Hence, the central angle for each activity will be calculated as follows


Item



Expenditure
(in %)



Sector angle (degree)s



Food



40



40/100 × 360 = 144



Entertainment



25



25/100 × 360 = 90



Other expenditures



20



20/100 × 360 = 72



Savings



15



15/100 × 360 = 54



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.



11