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Everyday maths 2

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# 4.1 Drawing pie charts

The best way to understand the steps involved in drawing a pie chart is to watch the worked example in the video below.

Interactive feature not available in single page view (see it in standard view).

Now have a go at drawing a pie chart for yourself.

## Activity 5: Drawing a pie chart

A leisure centre wants to compare which activities customers choose to do when they visit the centre. The information is shown in the table below. Draw an accurate pie chart to show this information.

Table 7
ActivityNumber of customers
Swimming26
Gym17
Exercise class 20
Sauna9

Firstly, work out the total number of customers: 26 + 17 + 20 + 9 = 72.

Now work out the number of degrees that represents customer: 360˚ ÷ 72 = 5˚ per customer.

Table 8
ActivityNumber of customersNumber of degrees
Swimming2626 × 5 = 130˚
Gym1717 × 5 = 85˚
Exercise class 2020 × 5 = 100˚
Sauna99 × 5 = 45˚

Now use this information to draw your pie chart. It should look something like this:

Figure 10 Pie chart for customer leisure centre activities

Now that you can accurately draw a pie chart, it’s time to look at how to interpret them. You won’t always be given the actual data, you may just be given the total number represented by the chart or a section of the chart and the angles on the pie chart itself. It’s useful to know how to use your maths skills to work out the actual figures.

Here’s a reminder of the degrees of a circle which will be useful when you come to read from pie charts.

Figure 11 Degrees of a circle