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Pie Charts

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Pie Charts

Let’s say there are a total of 36 people who are all to be given equal slices of a Mathematical Pie. And you are one of the 36.

How many degrees do you get?

The key to it is: There are 360o in a circle.

Can you work out how many of the 360 degrees that you’d get?

In a more general way

- Let Total number of people = 360o
- Find what 1 person is worth in degrees (divide 360 by the number of people)
- Work out the number of degrees for each section

eg1. Complete a pie chart for the following data

A class were surveyed about there favourite ice cream

24 people = 3600

360

24

1 person =

1 person =

150

6 people =

900

4 people =

600

600

900

x

7 people =

1050

1050

600

3 people =

450

450

4 people =

600

eg2. Complete a pie chart for the following data

A year group were surveyed about there favourite group

120 people = 3600

360

120

1 person =

1 person =

30

25 people =

750

40 people =

1200

1200

750

x

15 people =

450

150

1050

450

35 people =

1050

150

5 people =

- IN SUMMARY - Drawing a pie chart
- Mark the centre of the circle C with an x

- Place the point of the compass here and draw your circle
- (any radius but 4cm would be good for practice)

- Draw a horizontal line from the centre of the circle
- X to the left side of the circle

x

- Place the heart of the protractor at x and the 00 along the line …. and
- measure the required angle

- Place the heart of the protractor at x and the 00 along the line you have just drawn and measure the required angle