Elongated pyramid

In geometry, the elongated pyramids are an infinite set of polyhedra, constructed by adjoining an $n$-gonal pyramid to an $n$-gonal prism. Along with the set of pyramids, these figures are topologically self-dual.

There are three elongated pyramids that are Johnson solids: Higher forms can be constructed with isosceles triangles.
 * Elongated triangular pyramid ($4n$),
 * Elongated square pyramid ($2n + 1$), and
 * Elongated pentagonal pyramid ($C_{nv}, [n], (*nn)$).