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The 5 sides of the Pentagon represent the 5 branches
A pentagon has 0, but if you mean a pentahedron, then it depends on how you build it.
Each of the 5 branches of the military has a side of the pentagon.
It is a 5 sided shape with the properties that any line segment between two vertices of the pentagon remain in the boundaries of that pentagon. It generalizes to polygons.
Assuming you mean a pentagon - not penagon, a 3-dimensional pentagon is a dodecahedron which has 12 faces.