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Primitive Perfect Isosceles Right Triangled Square

Title: __ 18:40AC GHM

Order: 18

Horizontal side: 40 Vertical side: 40

Elements: 1√2, 2, 2√2, 4, 4√2, 6, 5√2, 8, 6√2, 8√2, 12, 14, 10√2, 16, 12√2, 14√2, 16√2, 20√2.

Code: 202 20 20 164 16 24 163 32 24 82 40 32 81 40 40 106 30 22 64 22 18 63 28 18 122 40 12 24 30 22 16 19 19 25 20 18 50 19 19 44 24 14 43 28 14 140 14 14 141 28 14 123 40 0

The properties below may precede order:side in a tiling's title:

Credit for Discovery

Just three people are credited with the discovery of Primitive Perfects:

Geoffrey H. Morley (GHM, England)

Jasper D. Skinner, II (JDS, United States)

William T. Tutte (WTT, Canada, 1917-2002) (15:44AI, 17:136AJ and 19:56AJ only)

20√2
16√2
16
8√2
8
10√2
6√2
6
12√2
2√2
1√2
2
5√2
4√2
4
14√2
14
12