Similar triangles

 dans Euclide Geometry Principles par Harvey Littleman

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Triangles are similar <=>

• they have the same shape, but can be different sizes
• the sides are proportional : AB/A’B’=AC/A’C’=BC/B’C’ (SSS)
• two angles are equal (AA)
• two sides are proportional and the angles between them are equal (SAS)

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