Making A Pie Chart.

Favourite Holiday Country

Italy

FranceU.S.A

Spain

Scotland

The Car Survey.

A group of people were asked what make of car they would most like to own from a choice of 5 makes. The results are shown below:

Make Number of Votes

Ford 20

Nissan 26

Rover 18

Fiat 14

Vauxhall 12

Total.

Calculate how many people voted in the survey.

90

Creating A Pie Chart.

Make Number of Votes

Ford 20

Nissan 26

Rover 18

Fiat 14

Vauxhall 12

Total. 90

Your task will be to turn this table of results into a pie chart.

The first thing we have to do is to calculate the angle needed in the pie chart for each car.

Calculating The Angles.You know that 20 out of the ninety people asked voted for Ford.

If twice or three times as many voted for Ford what would happen to the angle ?

The angle would double or treble etc.

What is this an example of ?

Direct proportion.

To calculate the angle consider the following:

If 90 votes are represented by an angle of 360o. What angle represents 20 votes ?

What two things are mentioned?Votes Angle.

What two numbers go together?90 360

Do you want to calculate an angle or a number of votes ?

An angle.20 X o

If the votes double or triple what happens to the angle?

Double or triple as well.

Now cross multiply and solve.

x

360

20

90

2036090 x80x The angle is 80 o

Now complete the table below for all the angles:

Make Votes Angle

Ford 20 80o

Nissan 26

Rover 18

Fiat 14

Vauxhall 12

Total 90

104o

72o

56o

48o

360o

Now we can draw the pie chart.

Creating The Pie Chart.Draw a reasonably large circle and mark the radius as shown below:

Using the radius as the zero degree line, measure an angle of 80o for the Ford votes.

80o

Ford

20

Now using the red line as the new zero degree line measure an angle of 104o for Nissan

104o

Nissan

26

Now using the blue line draw an angle of 72o for Rover.

Rover

14

Now an angle of 56o for Fiat should leave you with 48o for Vauxhall.

Fiat

14

Vauxhall

12

Give your pie chart a title to finish.

Most popular make of car.

Making Your Own Pie Chart.

Now create your own pie chart using the data below:

A group of people were asked for their favourite country to go on holiday to. The results are shown in the table below:

Country Number

Italy 6

France 10

U.S.A 8

Spain 14

Scotland 22

36o

Italy

France

60o

U.S.A

48o

Spain

84o

Scotland

132o

Favourite Holiday Country