The number of hours, spent by a school boy on different activities in a working day, is given below :
Activities: | Sleep | School | Home | Play | Others | Total |
Number of hours | 8 | 7 | 4 | 2 | 3 | 24 |
Present the information in the form of a pie-chart.
Here, total number of hours = 24
So,
The central angle = 
× 360°
Hence, the central angle for each activity will be calculated as follows
Activity | Number of hours | Sector angle (degree) |
Sleep | 8 | 8/24 × 360 = 120° |
School | 7 | 7/24 × 360 = 105° |
Home | 4 | 4/24 × 360 = 60° |
Play | 2 | 2/24 × 360 = 30° |
Others | 3 | 3/24 × 360 = 45° |
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.
