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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.

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## Glossary

### union

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

Full Glossary List

## This question appears in the following syllabi:

SyllabusModuleSectionTopicExam Year
AQA GCSE (9-1) Foundation (UK)G: Mensuration and CalculationG19: Applying Congruence and SimilaritySimilarity-
CBSE IX (India)GeometryTrianglesCongruence and similarity-
CBSE X (India)GeometryTrianglesSimilar triangles-
CIE IGCSE (9-1) Maths (0626 UK)3 GeometryB3.4 Similar FiguresSimilarity-
Edexcel GCSE (9-1) Foundation (UK)G: Mensuration and CalculationG19: Applying Congruence and SimilaritySimilarity-
GCSE Higher (UK)GeometryProperties of shapesSimilarity-
OCR GCSE (9-1) Foundation (UK)9: Congruence and Similarity9.04c: Similar ShapesMore Lengths in Enlargements-
Universal (all site questions)PProperties of shapesSimilarity-