Two geometric figures are congruent when one can match the other perfectly by sliding, flipping, or turning it. This can be done by applying a translation, a rotation, a reflection or a combination of these transformations. These figures can be described as being congruent by a translation, congruent by a rotation, etc.
- Two figures congruent by a rotation:
- Two figures congruent by a translation:
- Two figures congruent by a reflection: