Question 1020080
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Definition:


A rigid transformation (also called an isometry) is a transformation of the plane that preserves length. 
Reflections, translations, rotations, and combinations of these three transformations are "rigid transformations".


From <A HREF=http://mathbitsnotebook.com/Geometry/Transformations/TRRigidTransformations.html>http://mathbitsnotebook.com/Geometry/Transformations/TRRigidTransformations.html</A>