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A pentahedron is polyhedron having five faces. Because there are two pentahedral graphs, there are two convex pentahedra, corresponding to the topologies of the square pyramid and the triangular prism.
 |  |  | name |
| 5 | 5 | 8 | square pyramid |
| 5 | 6 | 9 | triangular prism |
The convex pentahedra are illustrated above, together with their skeletons and polyhedral graphs (i.e., duals of the skeletons).
