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A molecular graph is a simple graph such that its vertices correspond to the atoms and the edges to the bonds. A path of a length n in a graph G is a sequence of n +1 vertices such that from each of these vertices there is an edge to the next vertex in the sequence. Let G be a molecular graph, with the vertex and edge sets of which are represented by V(G) and E(G), respectively. The distance , d(u,v) is defined as the length of the shortest path between u and v in G. D(u) denotes the sum of distances between u and all other vertices of G. For a given vertex u of V(G) its eccentricity, ecc(u) is the largest distance between u and any other vertex v of G. The maximum eccentricity over all vertices of G is called the diameter of G and denoted by Diam(G) and the minimum eccentricity among the vertices of G is called radius of G and denoted by R(G).

Degree Distance and Reverse Degree Distance of one Tetragonal Carbon Nanocones