Non-ultraperfect Perfect Isosceles Right Triangled Square

Title: _ 9:20PA4of4

Order: 9

Horizontal side: 20 Vertical side: 20

Elements: 1√2, 2, 2√2, 3√2, 4√2, 6, 10, 10√2, 20.

Code: 207 0 20 106 10 10 103 10 0 65 10 4 22 12 2 34 13 1 40 16 4 23 12 0 12 13 1

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)