Tiling with digons and squares, case a

• The symmetry group of the tiling is 2222 (p2).
• All the internal angles of the constituent polygons are a multiple of 18°.
• Contains one square.
• Contains one regular two-pointed star polygon with vertex angle of 18°.
• The tiling satisfies the two-colour condition.
• The tiling is edge-to-edge.
• As drawn, contains about 36 polygons.

• Uniform Star Polygons with Digons of B A Wichmann. The World of Patterns, World Scientific, 2001. ISBN 981024619. [wich2] {Only new patterns ascribed to this.}

• Tiling whose angles are a multiple of 18°

Photo?

v29