Squaring.net >> IRTS >> NPIRTSS >> Order 9

Non-ultraperfect Perfect Isosceles Right Triangled Square

Title: _ 9:20PA3of4

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 42 14 6 36 11 3 65 14 0 10 11 3 27 10 2 20 12 2

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:

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)

20
10√2
10
4√2
3√2
6
1√2
2
2√2