Otherwise walk is called open. A closed x-y trail is called a circuit. The term cycle is used to describe a closed x-x path. An interactive example about the path,trail and circuits. The below table shows that a path is a trail, which in turn an open walk.
Every cycle is a circuit, and every circuit is a closed walk.
Yes Yes . No Yes . No No Yes . The degree of a vertex is the number of edges incident to it. A graph G is called planar if G can be drawn in the plane with its edges intersecting only at vertices.