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Rhombitriheptagonal tiling : ウィキペディア英語版 | Rhombitriheptagonal tiling
In geometry, the rhombitriheptagonal tiling is a semiregular tiling of the hyperbolic plane. At each vertex of the tiling there is one triangle and one heptagon, alternating between two squares. The tiling has Schläfli symbol rr. It can be seen as constructed as a rectified triheptagonal tiling, r, as well as an expanded heptagonal tiling or expanded order-7 triangular tiling. == Dual tiling ==
The dual tiling is called a ''deltoidal triheptagonal tiling'', and consists of congruent kites. It is formed by overlaying an order-3 heptagonal tiling and an order-7 triangular tiling. :
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