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Drawing pie charts
A pie chart is a circle divided into different sectors and it is a good way to make quick comparisons. We can make two pie charts to compare preferences of boys and girls from the following data.
3 Copy and complete the table with the total number of boys and girls in class 9CT.
favourite sport girls
football
swimming
tennis
girls
4
7
7
18 (girls)
Boys
9
6
3
18 (boys)
Before we can draw the pie charts we need to calculate the ANGLE of the sector representing each sport. To find this, we need to know the FRACTION of the students who prefer each sport and then multiply the fraction by 360 degrees.
4 Copy and complete the table with the angles.
favourite sport
football
swimming
tennis
girls
4/18 x 360
7/18 x 360
7/18 x 360
ANGLE
140
140
boys
9/18 x 360
6/18×360
3/18×360
ANGLE
…
120
…
a) Draw a circle and a radius.
b) Measure the angles carefully with a protractor.
c) The completed pie chart for girls looks like this.
5 Draw the two pie charts in your notebook.
Project
Write a questionnaire for your class to find out what they think about school. Show the data using different kinds of diagrams.
Plan
Write a questionnaire for your classmates. You could include questions like these:
1 Which school subject do you like best?
a) Maths
b) English
c) PE
2 How much time do you spend each week doing homework?
a) less than one hour
b) between one hour and three hours
c) more than three hours but less than six hours
3 Which school subject do you find most difficult?
a) Maths
b) English
c) Science
Research
Put the data into a table like this.
1 Which school subject do you like best?
Maths English PE
boys 7 5 11
girls 5 6 12
Prepare
Decide on the best way to show your data using different kinds of diagrams. Draw the diagrams.
Present your material
Put your graphs on a poster and write a short text to explain what you found.
Drawing pie charts
A pie chart is a circle divided into different sectors and it is a good way to make quick comparisons. We can make two pie charts to compare preferences of boys and girls from the following data.
3 Copy and complete the table with the total number of boys and girls in class 9CT.
favourite sport girls
football
swimming
tennis
girls
4
7
7
18 (girls)
Boys
9
6
3
18 (boys)
Before we can draw the pie charts we need to calculate the ANGLE of the sector representing each sport. To find this, we need to know the FRACTION of the students who prefer each sport and then multiply the fraction by 360 degrees.
4 Copy and complete the table with the angles.
favourite sport
football
swimming
tennis
girls
4/18 x 360
7/18 x 360
7/18 x 360
ANGLE
140
140
boys
9/18 x 360
6/18×360
3/18×360
ANGLE
…
120
…
a) Draw a circle and a radius.
b) Measure the angles carefully with a protractor.
c) The completed pie chart for girls looks like this.
5 Draw the two pie charts in your notebook.
Project
Write a questionnaire for your class to find out what they think about school. Show the data using different kinds of diagrams.
Plan
Write a questionnaire for your classmates. You could include questions like these:
1 Which school subject do you like best?
a) Maths
b) English
c) PE
2 How much time do you spend each week doing homework?
a) less than one hour
b) between one hour and three hours
c) more than three hours but less than six hours
3 Which school subject do you find most difficult?
a) Maths
b) English
c) Science
Research
Put the data into a table like this.
1 Which school subject do you like best?
Maths English PE
boys 7 5 11
girls 5 6 12
Prepare
Decide on the best way to show your data using different kinds of diagrams. Draw the diagrams.
Present your material
Put your graphs on a poster and write a short text to explain what you found.
Starter unit
Unit 1
Unit 2
Unit 3
Revision 1
Unit 4
Unit 5
Unit 6
Revision 2
Unit 7
Unit 8
Unit 9
Revision 3
Across the curriculum