Non-ultraperfect Perfect Isosceles Right Triangled Square

Title: _ 12:40PB

Order: 12

Horizontal side: 40 Vertical side: 40

Elements: 1√2, 2, 6, 5√2, 6√2, 10, 8√2, 12, 9√2, 18, 17√2, 40.

Code: 407 0 40 183 40 22 56 17 17 105 22 12 94 31 13 86 32 14 170 17 17 16 31 13 25 32 12 121 34 12 62 40 6 63 40 0

The fact that every NPIRTS has a subdivided triangle is not recorded as a property. The properties below may precede order:side in a tiling's title:

• e = elegant. No tiling is just a T-junction. Such tilings may be considered aesthetically pleasing.
• p/r = pseudotriangular/rectangular inclusion subdivided into at least 6/5 triangles respectively.

Credit for Discovery

Jasper D. Skinner found many NPIRTS's before this catalogue was built by Geoffrey H. Morley. Only the two lowest order NPIRTS's are attributed to discoverers:

J. Douglas and E.P. Starke (D&S, United States) (7:10PA only)

Arthur H. Stone (AHS, United States, 1916-2000) (7:7PA only)