The specific method is as follows:

The first one can be divided into whether it is a centrally symmetric figure (a figure that rotates around the midpoint of the figure 180 and still coincides with the original figure is a centrally symmetric figure).

The second type can be divided into whether it is an axisymmetric figure (a figure that is still completely coincident after being folded in half is an axisymmetric figure)

Is the third kind a parallel graph (a graph with parallel edges is a parallel graph)?

Mathematical graphics is the most commonly used and common mathematical problem in a year. It is easy to master and understand.