Circle Packing
The Truncated trihexagonal tiling can be used as a circle packing, placing equal diameter circles at the center of every point. Every circle is in contact with 3 other circles in the packing (kissing number). Circles can be alternatedly colored in this packing with an even number of sides of all the regular polygons of this tiling.
The gap inside each hexagon allows for one circle, and each dodecagon allows for 7 circles, creating a dense 4-uniform packing.
Read more about this topic: Truncated Trihexagonal Tiling
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