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OpenStudy (happykiddo):
A polyhedron has 12 faces and 30 edges. What is the number of vertices of the polyhedron? 18 20 40 42
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Directrix (directrix):
Vertices + Faces = Edges + 2 (courtesty of Euler) V +12 = 30 + 2 V = 32 - 12 V = 20
OpenStudy (happykiddo):
very nice thanks for explanation too :D
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