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Description
An octahedron has eight triangles (yellow, F=8), twelve edges (green, E=12), and six vertices (blue, V=6). Watch them form the shape all at once, set by set, or piece by piece. Figure out what V - E + F is, for this and other polyhedra!

Description
An octahedron has eight triangles (yellow, F=8), twelve edges (green, E=12), and six vertices (blue, V=6). Watch them form the shape all at once, set by set, or piece by piece. Figure out what V - E + F is, for this and other polyhedra!