# Constructing pie charts

To construct a pie chart you need to work out the fraction of the total that the sector represents. Then convert this to an angle and draw the sector on the chart.

## Constructing pie charts using a table

### Example

The table below shows the grades achieved by pupils in their end-of-year exam:

To present this information on a pie chart, use the following steps:

1. Work out the total number of pupils:
2. To calculate the angle of each segment, work out the fraction of the total that got each grade. Start with A grades:
3. There are in a full turn. So to work out the angle, multiply the fraction by :
4. Repeat this process to find the angles for the other segments. Check that the angles are correct by seeing if they add to .
5. Once you have calculated the angles of the segments, construct the pie chart.
Question

Complete the following table. You could then use the data to construct a pie chart.