• Source: 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:

Elongated triangular pyramid (J7),
Elongated square pyramid (J8), and
Elongated pentagonal pyramid (J9).
Higher forms can be constructed with isosceles triangles.




Forms






See also


Gyroelongated bipyramid
Elongated bipyramid
Gyroelongated pyramid
Diminished trapezohedron




References


Norman W. Johnson, "Convex Solids with Regular Faces", Canadian Journal of Mathematics, 18, 1966, pages 169–200. Contains the original enumeration of the 92 solids and the conjecture that there are no others.
Victor A. Zalgaller (1969). Convex Polyhedra with Regular Faces. Consultants Bureau. No ISBN. The first proof that there are only 92 Johnson solids.

Kata Kunci Pencarian:

• Daftar bentuk matematika
• Elongated triangular pyramid
• Elongated pyramid
• Elongated square pyramid
• Elongated pentagonal pyramid
• Elongated square bipyramid
• Elongated pentagonal bipyramid
• Johnson solid
• Square pyramid
• Gyroelongated bipyramid
• Elongated square gyrobicupola