Definition:Similar Triangles

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Similar triangles are triangles whose corresponding angles are the same, but whose corresponding sides may be of different lengths.


Thus $\triangle ABC$ is similar to $\triangle DEF$:

$\angle ABC = \angle EFD$
$\angle BCA = \angle EDF$
$\angle CAB = \angle DEF$

Also see

  • Results about similar triangles can be found here.