Sector graph

Session 1

Sector graph

Circle graphPie chart

Use sectors of a circle to show sizes of parts

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.

Favourite sport

Football

Cicket

Motor racing

Rugby League

rugby Union

Soccer

Football

Cricket

Motor racing

Rugby League

Rugby Union

Soccer

Title

Sectors

Six types of sports are shown on the sector graph

KeyGraph Title – the title tells what the graph is representing.

Sectors – Each sector is one part of the whole circle. It represents a particular category.

Sector Labels – Each label tells what the sector represents.

Labels

20%

Percentage

Sector graph or pie chart Sector graphs are used when there are no more than six components .

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

Football

Cicket

Motor racing

Rugby League

rugby Union

Soccer

Foot-ball

Cricket

Motor racing

Rugby League

Rugby Union

Soccer

Favourite sport Australian football

Cricket Motor racing

Rugby League

Rugby Union

Soccer

Number of viewers

13 16 8 19 10 14

What you should know before calculating the angle size.1- What is the total number of people surveyed: 802- How many degrees are in a revolution: 360Calculate 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).

ExampleCalculate the angle size for Australian football:

x 360 =58.5

Favourite sport Australian football

Cricket Motor racing

Rugby League

Rugby Union

Soccer

Number of viewers

13 16 8 19 10 14

Number of people who chose Australian football

Total number of people surveyed

Calculate the angle size

Calculate the angle size for cricket:Write the number of people who chose the the first sport on topDivide by 80 ( the total number of people surveyedTimes by 360 ( revolution).

Favourite sport Australian football

Cricket Motor racing

Rugby League

Rugby Union

Soccer

Number of viewers

13 16 8 19 10 14

x 360 = Number of people who chose cricket

Total number of people surveyed

Calculate the angle size for Motor RacingWrite the number of people who chose the the first sport on topDivide by 80 ( the total number of people surveyedTimes by 360 ( revolution).

Favourite sport Australian football

Cricket Motor racing

Rugby League

Rugby Union

Soccer

Number of viewers

13 16 8 19 10 14

x 360 = Number of people who chose cricket

Total number of people surveyed

Calculate the angle size for Rugby LeagueWrite 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).

Favourite sport Australian football

Cricket Motor racing

Rugby League

Rugby Union

Soccer

Number of viewers

13 16 8 19 10 14

x 360 = Number of people who chose cricket

Total number of people surveyed

Calculate the angle size for Rugby UnionWrite the number of people who chose Rugby Union on topDivide by 80 ( the total number of people surveyed)Times by 360 ( degrees in a revolution).

Favourite sport Australian football

Cricket Motor racing

Rugby League

Rugby Union

Soccer

Number of viewers

13 16 8 19 10 14

x = Number of people who chose cricket

Total number of people surveyed

Calculate the angle size for SoccerWrite the number of people who chose soccer on topDivide by 80 ( the total number of people surveyed)Times by 360 ( degrees in a revolution).

Favourite sport Australian football

Cricket Motor racing

Rugby League

Rugby Union

Soccer

Number of viewers

13 16 8 19 10 14

x = Number of people who chose cricket

Total number of people surveyed

By: Zani Alam