What is Pentahedron?
[[File:Square pyramid.png|thumb|150px|A square pyramid pentahedron]] [[File:Triangular prism.png|thumb|120px|A triangular prism pentahedron]] In [[geometry]] a '''pentahedron''' is a [[polyhedron]] of five faces. With [[regular polygon]] faces, there are two types: # With a regular [[Pyramid (geometry)|pyramid]] shape, there is a classical square pyramid. # With a triangular prism there are two triangles and three squares. [[Category:Polyhedra]]