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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.

You can get a better display of the maths by downloading special TeX fonts from jsMath. In the meantime, we will do the best we can with the fonts you have, but it may not be pretty and some equations may not be rendered correctly.

## Glossary

### union

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

Full Glossary List