Two figures are said to be in a relationship of symmetry when one can be mapped to the other by a bijection such that two of their corresponding points are equidistant from and on either side of a point, line or plane.
Examples
In each illustration below, m¯\textupPO=\moverline\textupPO′.
- Symmetry about a point:
- Symmetry about a line:
- Symmetry about a plane:
