Truncated hexagonal tiling

Truncated hexagonal tiling

TypeSemiregular tiling
Vertex configuration
3.12.12
Schläfli symbolt{6,3}
Wythoff symbol2 3 | 6
Coxeter diagram
Symmetryp6m, [6,3], (*632)
Rotation symmetryp6, [6,3]+, (632)
Bowers acronymToxat
DualTriakis triangular tiling
PropertiesVertex-transitive

In geometry, the truncated hexagonal tiling is a semiregular tiling of the Euclidean plane. There are 2 dodecagons (12-sides) and one triangle on each vertex.

As the name implies this tiling is constructed by a truncation operation applies to a hexagonal tiling, leaving dodecagons in place of the original hexagons, and new triangles at the original vertex locations. It is given an extended Schläfli symbol of t{6,3}.

Conway calls it a truncated hextille, constructed as a truncation operation applied to a hexagonal tiling (hextille).

There are 3 regular and 8 semiregular tilings in the plane.

Uniform colorings

There is only one uniform coloring of a truncated hexagonal tiling. (Naming the colors by indices around a vertex: 122.)

Topologically identical tilings

The dodecagonal faces can be distorted into different geometries, like:

Wythoff constructions from hexagonal and triangular tilings

Like the uniform polyhedra there are eight uniform tilings that can be based from the regular hexagonal tiling (or the dual triangular tiling).

Drawing the tiles colored as red on the original faces, yellow at the original vertices, and blue along the original edges, there are 8 forms, 7 which are topologically distinct. (The truncated triangular tiling is topologically identical to the hexagonal tiling.)

Symmetry mutations

This tiling is topologically related as a part of sequence of uniform truncated polyhedra with vertex configurations (3.2n.2n), and [n,3] Coxeter group symmetry.

Two 2-uniform tilings are related by dissected the dodecagons into a central hexagonal and 6 surrounding triangles and squares.[1][2]

1-uniform Dissection 2-uniform dissections

(3.12.12)

(4.3.4.5) & (3.3.3.4.4)
(4.3.4.5) & (3.3.4.3.4)

Circle packing

The truncated hexagonal tiling can be used as a circle packing, placing equal diameter circles at the center of every point.[3] Every circle is in contact with 3 other circles in the packing (kissing number). This is the lowest density packing that can be created from a uniform tiling. The dodecagonal gaps can be filled perfectly with 7 circles, creating a denser 3-uniform packing.

Triakis triangular tiling

Triakis triangular tiling
TypeDual semiregular tiling
Coxeter diagram
Facestriangle
Face configurationV3.12.12
Symmetry groupp6m, [6,3], (*632)
Rotation groupp6, [6,3]+, (632)
DualTruncated hexagonal tiling
Propertiesface-transitive
On painted porcelain, China

The triakis triangular tiling is a tiling of the Euclidean plane. It is an equilateral triangular tiling with each triangle divided into three obtuse triangles (angles 30-30-120) from the center point. It is labeled by face configuration V3.12.12 because each isosceles triangle face has two types of vertices: one with 3 triangles, and two with 12 triangles.

Conway calls it a kisdeltille,[4] constructed as a kis operation applied to a triangular tiling (deltille).

In Japan the pattern is called asanoha for hemp leaf, although the name also applies to other triakis shapes like the triakis icosahedron and triakis octahedron.[5]

It is the dual tessellation of the truncated hexagonal tiling which has one triangle and two dodecagons at each vertex.[6]

It is one of 7 dual uniform tilings in hexagonal symmetry, including the regular duals.

Dual uniform hexagonal/triangular tilings
Symmetry: [6,3], (*632) [6,3]+, (632)
V63 V3.122 V(3.6)2 V36 V3.4.12.4 V.4.6.12 V34.6

See also

Wikimedia Commons has media related to Uniform tiling 3-12-12.

References

  1. ↑ Chavey, D. (1989). "Tilings by Regular Polygons—II: A Catalog of Tilings". Computers & Mathematics with Applications. 17: 147–165. doi:10.1016/0898-1221(89)90156-9.
  2. ↑ http://www.uwgb.edu/dutchs/symmetry/uniftil.htm
  3. ↑ Order in Space: A design source book, Keith Critchlow, p.74-75, pattern G
  4. ↑ John H. Conway, Heidi Burgiel, Chaim Goodman-Strass, The Symmetries of Things 2008, ISBN 978-1-56881-220-5 (Chapter 21, Naming Archimedean and Catalan polyhedra and tilings, p288 table)
  5. ↑ http://www.mikworks.com/originalwork/asanoha/
  6. ↑ Weisstein, Eric W. "Dual tessellation". MathWorld.

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