drawing pie charts
To show this information in a pie chart, take the following steps:
Work out the total number of pupils: 7 + 11 + 6 + 4 + 2 = 30
To work out the angle of each segment, work out the fraction of the total that got each grade.
Start with A grades: 7 /30
There are 360° in a full turn, so to work out the angle, multiply the fraction by 360: 7 /30 × 360 = 84°