# Pie charts

## In a nutshell

A pie chart shows things as proportions. The size of each sector of the circle tells you how big the proportion is and can be written as a percentage, a fraction or in degrees.

## Reading pie charts

Each shaded part of the circle is a sector. There are 360° in a circle and so each sector has an angle which is a fraction or percentage of 360.

##### Example

*The pie chart represents modes of transport taken to school by 20 students. How many students walk?*

*The angle at the centre of the walking sector is $90\degree$*. Work out this as a fraction of $360\degree$.

*$90$ is $\frac{1}{4}$ of $360$*

**

Work out a quarter of the total number of students: $20.$

*$\frac{1}{4}$ of $20$ is $5$*

**

__Five__ students walk to school.

## Drawing pie charts

#### PROCEDURE

1. | Work out the proportion for each category. |

2. | Draw each category with the correct proportion. |

3. | Label each sector with the correct category. |