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Question

What is meant by F+V=E+2 ?

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Solution

For any polyhedron that doesn't intersect itself, the
Number of Faces
plus the Number of Vertices (corner points)
minus the Number of Edges
always equals 2
This can be written: F + V − E = 2
A cube has 6 Faces, 8 Vertices, and 12 Edges,
so: 6 + 8 − 12 = 2

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