Page 190 - New Medley 5 Semester 2

Circle Graph or Pie Chart

In this representation, data are displayed through different sectors in a

circle. Sectors are constructed by finding the central angle for a certain
head. We can calculate the central angle using this formula:

Value of a certain head
Central angle = × 360 °
Sum of values of all heads

Example 3 : Anuj recorded the times spending in different activities
during a day as shown below:

Activities Sleeping Studying Playing Others

Time (in h) 8 hours 10 hours 2 hours 4 hours

Display this information through a pie chart.

Solution: First, we calculate the measures of central angles for

different activities.

Activities Time (in h) Central angle

8
Sleeping 8 × 360° = 120°
24

10
Studying 10 × 360° = 150°
24

2
Playing 2 × 360° = 30°
24
4
Others 4 × 360° = 60°
24

Then, we draw a circle of any
radius and make sectors for the
Sleeping
central angles calculated in the
120°
table. Also label the sectors as
Studying 60°
shown alongside.
150° 30° Others

Playing
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