`"2" = "Total Number of Vertices"_("Sphere") - "Total Number of Edges"_("Sphere") + "Total Number of Faces"_("Sphere") `

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Euler's Equation states that if you cut the surface of a sphere up into faces, edges and vertices, and let F be the number of faces, E the number of edges and V the number of vertices, you will always get V – E + F = 2.