A figure is folded in half along a straight line, and the parts on both sides of the straight line can completely overlap.

This straight line is called the axis of symmetry. Points that coincide with each other are called corresponding points.

2, axial symmetry:

Two figures are folded in half along a straight line, and one of them can completely coincide with the other.

This straight line is called the axis of symmetry. Points that coincide with each other are called corresponding points.

3, the difference and connection between axisymmetric graphics and axisymmetric:

(1) difference. Axisymmetric graphics discuss "the symmetrical relationship between graphics and straight lines"; Axisymmetry discusses "the symmetrical relationship between two figures and a straight line".

(2) contact. In axisymmetric graphics, "the parts on both sides of the axis of symmetry are regarded as two graphics" is axisymmetric; Axisymmetric "two figures as a whole" is an axisymmetric figure.