### Pie Charts

Pie charts are circles split into sections

To draw a pie chart:

(a) | Find the total frequency |

(b) | Find the angle of one frequency: |

360 degrees/total frequency | |

(c) | Find the degrees of each section: |

angle of one frequency × no of items in one section | |

(d) | Draw the pie chart |

- Example 1. Draw a Pie Chart of the number of cakes sold

Cake | Frequency f |

Chocolate Cake | 24 |

Coffee & Walnut | 22 |

Carrot Cake | 14 |

Victoria Sponge | 30 |

**(a)** Add up the frequencies to work out the total

Cake | Frequency f |

Chocolate Cake | 24 |

Coffee & Walnut | 22 |

Carrot Cake | 14 |

Victoria Sponge | 30 |

Total | 90 |

**(b)** Find the angle of one cake:

Angle of one cake sold: 360 degrees / total frequency

Angle of one cake: 360/90 = 4

**(c)** Find the degrees of each section:

Cake | f | angle for each section |

Chocolate Cake | 24 | 24 × 4 = 96 |

Coffee & Walnut | 22 | 22 × 4 = 88 |

Carrot Cake | 14 | 14 × 4 = 56 |

Victoria Sponge | 30 | 30 × 4 = 120 |

Total | 90 | 90 × 4 = 360 |

**(d)** Draw the Pie Chart:

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