# 3-Regular Polyhedron: How many square faces can the polyhedron have?

5. The faces of a 3-regular polyhedron are all squares or hexagons. How many square faces can the polyhedron have? Does the number of square faces uniquely determine the polyhedron? (Please see attachment)

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Solution:

First of all, we have to state precisely that we are talking about convex polyhedrons.

For every convex polyhedron (either regular or not) it is valid the Euler relation:

v + f - e = 2 ( 1)

where

v = no. of vertices

f = no. of faces

e = no. of edges

Let denote ...

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