Direct Isometry
Geometric transformation in the plane that preserves orientation.
Translations, rotations and their compositions are direct isometries.
Reflections are not direct isometries; they are opposite isometries, also called flips.
Examples
- a translation :
- a rotation :
- the composition of a translation [latex]t[/latex] and a rotation [latex]r[/latex] with a centre O:
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