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Primitive Perfect Isosceles Right Triangled Square

Title: _d 19:216AT GHM

Order: 19

Horizontal side: 216 Vertical side: 216

Elements: 6, 6√2, 12, 9√2, 18, 20, 20√2, 21√2, 40, 30√2, 31√2, 37√2, 40√2, 68, 88, 108, 88√2, 128, 108√2.

Code: 1285 0 88 1084 108 108 1083 216 108 204 128 88 203 148 88 312 179 77 681 216 108 887 0 88 880 88 88 304 118 58 216 127 67 370 179 77 90 127 67 181 136 58 125 136 46 65 136 40 64 142 40 404 176 0 403 216 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)

128
108√2
108
20√2
20
31√2
68
88
88√2
30√2
21√2
37√2
9√2
18
12
6
6√2
40√2
40