Interesting, pentahedron, there are 2, so another besides the square pyramid.
Pentahedron - Wikipedia, the free encyclopedia
Quote:
In geometry, a pentahedron (plural: pentahedra) is a polyhedron with five faces. Since there are no face-transitive polyhedra with five sides and there are two distinct topological types, this term is rarely used.
With regular polygon faces, the two topological forms types are the square pyramid and triangular prism. Geometric variations with irregular faces can also be constructed.
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Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa
SOLD 2004 - gone but not forgotten