# Pie Charts

A **pie chart** can be used to represent all types of variables, but is more commonly used for categorical variables.

The data is represented in a circle and the **angle** of each circular sector is **proportional** to the corresponding **absolute frequency**.

The pie chart can be constructed with the help of a protractor.

#### Example

In a class of 30 students, 12 play basketball, 3 swim, 9 play football and the rest do not practice any sport.

Students | Angle | |
---|---|---|

Basketball | 12 | 144° |

Swimming | 3 | 36° |

Football | 9 | 108° |

No sport | 6 | 72° |

Total | 30 | 360° |