One triangle is defined for each vertex presented after the first two vertices. A triangle is a polygon with three edges and three vertices. Edges have "p" vertices, and vertex figures are "r"-gonal. Metes are points which are like the vertices (corners) of a polygon. Compare the amount of rotation associated with the vertices of a polygon. Gouraud shading is specifically linear interpolation of color between vertices. Its Cartesian coordinates are the means of the coordinates of the three vertices. The skeleton of the dodecahedron (the vertices and edges) form a graph. The skeleton of the icosahedron (the vertices and edges) forms a graph. For odd n, vertices n, n+1, and n+2 define triangle n. The vertices themselves have the coordinates formula 8. Joining the twenty vertices would form a regular dodecahedron. Let formula 9 be a graph with formula 10 vertices. Let formula 3 be a graph with formula 4 vertices. A complete graph formula 5 of "n" vertices requires formula 6 colors.