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Primitive Perfect Isosceles Right Triangled Square

Title: __ 19:90AX GHM

Order: 19

Horizontal side: 90 Vertical side: 90

Elements: 4, 3√2, 4√2, 8, 12, 15, 16, 20, 21, 18√2, 20√2, 21√2, 30, 24√2, 27√2, 40, 42, 30√2, 60.

Code: 605 0 30 421 42 90 212 63 69 244 66 66 276 63 63 213 63 48 32 66 66 155 63 48 184 60 30 83 78 40 125 78 36 403 70 0 202 90 20 44 74 36 43 78 36 161 90 36 305 0 0 304 30 0 203 90 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)

60
42
21√2
24√2
27√2
21
3√2
15
18√2
8
12
40
20√2
4√2
4
16
30
30√2
20