It is the sum of the y-coordinates of the vertices divided by the number of vertices.
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Assuming a rectangular box, there would be 8 vertices (vertices mean corners)
Vertices = Corners
If you mean a nonagon then it has 9 vertices and 9 sides
Vertices are corners. Thus, there are 4 corners in a square.
Assuming that you mean diagonal (not diagnol) lines, they are straight lines that join non-adjacent vertices in a polygon or polyhedron.