Two triangles are similar if they have exactly the same shape. They may have different sizes though.

## Summary/Background

If two shapes are similar then one is an enlargement of the other.

## Software/Applets used on this page

## Glossary

### union

The union of two sets A and B is the set containing all the elements of A and B.

## This question appears in the following syllabi:

Syllabus | Module | Section | Topic |
---|---|---|---|

AQA GCSE (9-1) Foundation (UK) | G: Mensuration and Calculation | G19: Applying Congruence and Similarity | Similarity |

CBSE IX (India) | Geometry | Triangles | Congruence and similarity |

CBSE X (India) | Geometry | Triangles | Similar triangles |

CIE IGCSE (9-1) Maths (0626 UK) | 3 Geometry | B3.4 Similar Figures | Similarity |

Edexcel GCSE (9-1) Foundation (UK) | G: Mensuration and Calculation | G19: Applying Congruence and Similarity | Similarity |

GCSE Higher (UK) | Geometry | Properties of shapes | Similarity |

OCR GCSE (9-1) Foundation (UK) | 9: Congruence and Similarity | 9.04c: Similar Shapes | More Lengths in Enlargements |

Universal (all site questions) | P | Properties of shapes | Similarity |