Roundel, Friday mosque, Isfahan

• The symmetry group of the tiling is *5.0• (d5.0).
• All the internal angles of the constituent polygons are a multiple of 36°.
• Contains four regular pentagons.
• Contains two regular 10-pointed star polygons with vertex angle of 108°.
• There are two non-regular reflective tiles.
• The tiling is edge-to-edge.
• As drawn, contains about 106 polygons.

1. Page 152, Fig 5.77 (Friday mosque, Isfahan, Iran. Roundel) of Eric Broug. Islamic Geometric Design, Thames and Hudson, 2013. ISBN 978050051695. [broug2] {Many excellent photos}(1310AD, 709AH)

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