All other figures are made of points. Three basic geometric figures are point, line, and plane. These three figures are described below. Plane is a flat surface has no thickness extends indefinitely in all directions can be named by three points of the plane that are not on the same line or by a capital script letter Graph theory is the branch of mathematics that uses connected points to represent real world situations. Maps are an example of this.
Dots often represent cities and segments the roads between cities.
The points may also be called nodes and the paths connecting the cities segments or edges. In some cases the edge must be a directed path. For example, if the specific path is from Dunsville to River City. A directed path is called a vector. CM , RD and MR are edges.