A pentahedron can have 5 or six vertices.
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A pentahedron in the form of a square pyramid has 5 vertices and in the form of a triangular prism has 6 vertices.
In geometry, a pentahedron is a polyhedron with five faces. That can either be a square pyramid with 5 vertices, 8 edges and 5 faces or a triangular prism with 6 vertices, 9 edges and 5 faces.
A four-sided pyramid (a type of irregular pentahedron) has 8 edges, 5 vertices and 5 faces.
15
Five.