Sultan Hassan mosque, Cairo

• The symmetry group of the tiling is 2*22 (cmm).
• All the internal angles of the constituent polygons are a multiple of 1.87 (π/96)°.
• Contains one regular 6-pointed star polygon with vertex angle of 78.75°.
• Contains one regular 8-pointed star polygon with vertex angle of 71.25°.
• There are 16 non-regular reflective tiles (including 5 kites).
• The tiling satisfies the interlace condition and has 8 finite interlaces and no infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 353 polygons.

1. Photo by David Wade: EGY 0709/13 (Sultan Hasan, Cairo, Egypt) of David Wade. Website: patterninislamicart.com, UK, 2015. [wadei] {Website}(1356AD, 757AH)
2. Thesaurus Islamicus, F1796 (Carved panels) of Not specific. Personal Communication, Information sent to the author, 21c. [pc]

• Wade photo EGY 0709
• Wade photo EGY 0713

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