A volume.
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Euler's formula is:V + F - E= 2V = the number of vertices, each point where three or more edges intersect.E = the number of edges, each intersection of the faces.F = the number of faces, each plane polygon.
triangle
Edges join two vertices. Three or more edges meet at a vertex (it could be two if not in a polyhedron).
eight * * * * * A triangular pyramid has six edges: three edges that form the triangular base and then three more edges going up from each vertex of the base to the apex (peak) of the pyramid.
Vertex.