Axisymmetric graphics are defined as graphics folded along a straight line in a plane, and the parts on both sides of the straight line can completely overlap. Its characteristic is that the axis of symmetry is a straight line, the distance between the corresponding points on both sides of the axis of symmetry is equal, it is folded in half along the axis of symmetry, and the left and right sides are completely coincident. The connecting line of the symmetrical points is perpendicular to the axis of symmetry and the figure is symmetrical.