Transcript Session 1 Sector graph Use sectors of a circle to show sizes of parts Pie chart Sector graph Circle graph Why circle graph/pie chart? • The circle provides a visual.

Session 1
Sector graph
Use sectors of a
circle to show sizes
of parts
Pie chart
Sector
graph
Circle graph
Why circle graph/pie chart?
• The circle provides a visual concept of
the whole (100%).
• Circle graphs/pie charts are simple to
use.
Sector graphs are used when there are no
more than six components only—otherwise,
the resulting picture will be too complex to
understand.
Sector graphs are used when there are
no more than six components .
Sector graph or pie chart
Title
Favourite sport
Graph Title – the title
tells what the graph is
representing.
Percentage
Soccer
Key
Football
Football
Cicket
20%
Rugby
Union
Cricket
Motor racing
Rugby League
rugby Union
Sectors
Sectors – Each sector is
one part of the whole
circle. It represents a
particular category.
Soccer
Rugby
League
Motor
racing
Six types of sports are
shown on the sector graph
Labels
Sector Labels – Each
label tells what the
sector represents.
Calculate the angle size
A group of 70 students was surveyed to find the group’s
favourite sport. The results are shown below:
Favourite sport
Number of
viewers
Australian
football
Cricket
Motor
racing
Rugby
League
Rugby
Union
Soccer
13
16
8
19
10
14
Favourite sport
Soccer
Football
Football
Cicket
Rugby
Cricket
Motor racing
Rugby League
Rugby
League
Motor
racing
rugby Union
Soccer
Calculate the angle size
What you should know before calculating the angle size.
1- What is the total number of people surveyed: 80
2- How many degrees are in a revolution: 360
Calculate the angle size:
1- Write the number of people who chose the first sport as a fraction : 13 (the number of
viewers for Australian football).
2- Divide by 80 ( the total number of people surveyed)
3- Times by 360 ( degrees in a revolution).
Example
Calculate the angle size for Australian football:
𝟏𝟑
𝟖𝟎
Number of people who
chose Australian football
x 360 =58.5
Total number of
people surveyed
Favourite sport
Number of
viewers
Australian
football
Cricket
Motor
racing
Rugby
League
Rugby
Union
Soccer
13
16
8
19
10
14
Calculate the angle size for cricket:
Write the number of people who chose the the first sport on top
Divide by 80 ( the total number of people surveyed
Times by 360 ( revolution).
𝟏𝟔
𝟖𝟎
Number of
people who
chose
cricket
x 360 =
Total number of
people surveyed
Favourite sport
Number of
viewers
Australian
football
Cricket
Motor
racing
Rugby
League
Rugby
Union
Soccer
13
16
8
19
10
14
Calculate the angle size for Motor Racing
Write the number of people who chose the the first sport on top
Divide by 80 ( the total number of people surveyed
Times by 360 ( revolution).
𝟖
𝟖𝟎
Number of
people who
chose
cricket
x 360 =
Total number of
people surveyed
Favourite sport
Number of
viewers
Australian
football
Cricket
Motor
racing
Rugby
League
Rugby
Union
Soccer
13
16
8
19
10
14
Calculate the angle size for Rugby League
Write the number of people who chose Rugby League on top (numerator)
Divide by 80 ( the total number of people surveyed) (denominator)
Times by 360 ( revolution).
𝟏𝟗
𝟖𝟎
Number of
people who
chose
cricket
x 360 =
Total number of
people surveyed
Favourite sport
Number of
viewers
Australian
football
Cricket
Motor
racing
Rugby
League
Rugby
Union
Soccer
13
16
8
19
10
14
Calculate the angle size for Rugby Union
Write the number of people who chose Rugby Union on top
Divide by 80 ( the total number of people surveyed)
Times by 360 ( degrees in a revolution).
x =
Number of
people who
chose
cricket
Total number of
people surveyed
Favourite sport
Number of
viewers
Australian
football
Cricket
Motor
racing
Rugby
League
Rugby
Union
Soccer
13
16
8
19
10
14
Calculate the angle size for Soccer
Write the number of people who chose soccer on top
Divide by 80 ( the total number of people surveyed)
Times by 360 ( degrees in a revolution).
x =
Number of
people who
chose
cricket
Total number of
people surveyed
Favourite sport
Number of
viewers
Australian
football
Cricket
Motor
racing
Rugby
League
Rugby
Union
Soccer
13
16
8
19
10
14
By: Zani Alam