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Primitive Perfect Isosceles Right Triangled Square

Title: _d 18:220AI GHM

Order: 18

Horizontal side: 220 Vertical side: 220

Elements: 2, 18√2, 19√2, 28, 21√2, 36, 38, 28√2, 42, 36√2, 54, 56, 42√2, 82, 110, 82√2, 138, 110√2.

Code: 1385 0 82 1104 110 110 1103 220 110 284 138 82 283 166 82 362 202 74 541 220 110 827 0 82 820 82 82 424 124 40 423 166 40 363 202 38 182 220 56 563 220 0 214 145 19 23 166 38 196 145 19 387 164 38

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)

138
110√2
110
28√2
28
36√2
54
82
82√2
42√2
42
36
18√2
56
21√2
2
19√2
38