(3.12*π/6.3.4**π/3;3.12.4*π/3.3.12*π/6)
 
 
  data178/T21
(Click on image for high-quality PDF version)
 
 
 
 data178/T21
(Click on image for high-quality PDF version) 
 
Geometry
 
 
-  The symmetry group of the tiling is *442 (p4m).
-  All the internal angles of the constituent polygons are a multiple of 30°.
-  Contains three equilateral triangles.
-  Contains one regular four-pointed star polygon with vertex angle of 60°.
-  Contains one regular 12-gon.
-  Contains one regular 12-pointed star polygon with vertex angle of 30°.
-  The tiling does not satisfy the two-colour condition.
-  The tiling is edge-to-edge.
-  As drawn, contains about 296 polygons.
 
References
 
 
Publications referenced: 
 
 
-  Figure 21 of Joseph S. Myers. 2-uniform tilings ..., www.polyomino.org.uk,	2009.	 [myers2]  Available on Internet.
Collections of similar tilings
 
 
 
  Photo?  
   v54