3-4-6-12 tiling

In geometry of the Euclidean plane, the 3-4-6-12 tiling is one of 20 2-uniform tilings of the Euclidean plane by regular polygons, containing regular triangles, squares, hexagons and dodecagons, arranged in two vertex configuration: 3.4.6.4 and 4.6.12.^[1]^[2]^[3]^[4]

It has hexagonal symmetry, p6m, [6,3], (*632). It is also called a demiregular tiling by some authors.

Geometry

Its two vertex configurations are shared with two 1-uniform tilings:

rhombitrihexagonal tiling	truncated trihexagonal tiling
3.4.6.4	4.6.12

It can be seen as a type of diminished rhombitrihexagonal tiling, with dodecagons replacing periodic sets of hexagons and surrounding squares and triangles. This is similar to the Johnson solid, a diminished rhombicosidodecahedron, which is a rhombicosidodecahedron with faces removed, leading to new decagonal faces.

The hexagons can be dissected into 6 triangles, and the dodecagaons can be dissected into triangles, hexagons and squares.

Dissected polygons
Hexagon	Dodecagon (each has 2 orientations)

3-uniform tilings
48	26	18
[3⁶; 3.3.4.3.4; 3.3.4.12]	[3.4.4.6; (3.4.6.4)2]	[3⁶; (3.3.4.3.4)2]

The dual tiling has right triangle and kite faces, defined by face configurations: V3.4.6.4 and V4.6.12, and can be seen combining the deltoidal trihexagonal tiling and kisrhombille tilings.

Dual tiling	V3.4.6.4 V4.6.12	Deltoidal trihexagonal tiling	Kisrhombille tiling

Keith Critchlow, Order in Space: A design source book, 1970, pp. 62–67
Ghyka, M. The Geometry of Art and Life, (1946), 2nd edition, New York: Dover, 1977. Demiregular tiling #15
Williams, Robert (1979). The Geometrical Foundation of Natural Structure: A Source Book of Design. Dover Publications, Inc. ISBN 0-486-23729-X. pp. 35–43
Grünbaum, Branko; Shephard, G. C. (1987). Tilings and Patterns. W. H. Freeman. ISBN 0-7167-1193-1. p. 65
Sacred Geometry Design Sourcebook: Universal Dimensional Patterns, Bruce Rawles, 1997. pp.36-37

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