Rectified prism

From HandWiki
Set of rectified prisms
Rectified pentagonal prism.png
Rectified pentagonal prism
Conway polyhedron notation aPn
Faces 2 n-gons
n squares
2n triangles
Edges 6n
Vertices 3n
Symmetry group Dnh, [2,2n], (*22n), order 4n
Rotation group Dn, [2,n]+, (22n), order 2n
Dual polyhedron Joined prism
Properties convex

In geometry, a rectified prism (also rectified bipyramid) is one of an infinite set of polyhedra, constructed as a rectification of an n-gonal prism, truncating the vertices down to the midpoint of the original edges. In Conway polyhedron notation, it is represented as aPn, an ambo-prism. The lateral squares or rectangular faces of the prism become squares or rhombic faces, and new isosceles triangle faces are truncations of the original vertices.

Elements

An n-gonal form has 3n vertices, 6n edges, and 2+3n faces: 2 regular n-gons, n rhombi, and 2n triangles.

Forms

The rectified square prism is the same as a semiregular cuboctahedron.

n 3 4 5 6 7 n
Image Rectified triangular prism.png Rectified square prism.png Rectified pentagonal prism.png Rectified hexagonal prism.png Rectified octagonal prism.png
Net Rectified triangular prism net.png Rectified square prism net.png Rectified pentagonal prism net.png Rectified hexagonal prism net.png Rectified octagonal prism net.png
Related Cuboctahedron.png
Cuboctahedron

Rectified star prisms also exist, like a 5/2 form:

Rectified pentagrammic prism.png

Dual

Set of joined prisms
Joined pentagonal prism.png
Joined pentagonal prism
Conway polyhedron notation jPn
Faces 3n
Edges 6n
Vertices 2+3n
Symmetry group Dnh, [2,2n], (*22n), order 4n
Rotation group Dn, [2,n]+, (22n), order 2n
Dual polyhedron Rectified prism
Rectified bipyramid
Properties convex

The dual of a rectified prism is a joined prism or joined bipyramid, in Conway polyhedron notation. The join operation adds vertices at the center of faces, and replaces edges with rhombic faces between original and the neighboring face centers. The joined square prism is the same topology as the rhombic dodecahedron. The joined triangular prism is the Herschel graph.

n 3 4 5 6 8 n
Image Joined triangular prism.png Joined square prism.png Joined pentagonal prism.png Joined hexagonal prism.png Joined octagonal prism.png
Net Joined triangular prism net.png Joined square prism net.png Joined pentagonal prism net.png Joined hexagonal prism net.png Joined octagonal prism net.png
Related Rhombicdodecahedron.jpg
Rhombic dodecahedron

See also

External links