Acronym tasa Name truncated hepteract Circumradius sqrt[19+12 sqrt(2)]/2 = 2.998773 Inradiuswrt. hop (7+6 sqrt(2))/sqrt(28) = 2.926443 Inradiuswrt. tox [1+sqrt(2)]/2 = 1.207107 Dihedral angles (at margins) at hix between hop and tox:   arccos[-1/sqrt(7)] = 112.207654° at tan between tox and tox:   90° Confer analogs: truncated hypercube tCn Externallinks

As abstract polytope tasa is isomorphic to quitasa, replacing thereby octagons by octagrams, resp. tic by quith, resp. tat by quitit, resp. tan by quittin, resp. tox by quotox.

Incidence matrix according to Dynkin symbol

```o3o3o3o3o3x4x

. . . . . . . | 896 |    6   1 |   15   6 |   20  15 |   15  20 |   6 15 |   1  6
--------------+-----+----------+----------+----------+----------+--------+-------
. . . . . x . |   2 | 2688   * |    5   1 |   10   5 |   10  10 |   5 10 |   1  5
. . . . . . x |   2 |    * 448 ♦    0   6 |    0  15 |    0  20 |   0 15 |   0  6
--------------+-----+----------+----------+----------+----------+--------+-------
. . . . o3x . |   3 |    3   0 | 4480   * |    4   1 |    6   4 |   4  6 |   1  4
. . . . . x4x |   8 |    4   4 |    * 672 ♦    0   5 |    0  10 |   0 10 |   0  5
--------------+-----+----------+----------+----------+----------+--------+-------
. . . o3o3x . ♦   4 |    6   0 |    4   0 | 4480   * |    3   1 |   3  3 |   1  3
. . . . o3x4x ♦  24 |   24  12 |    8   6 |    * 560 ♦    0   4 |   0  6 |   0  4
--------------+-----+----------+----------+----------+----------+--------+-------
. . o3o3o3x . ♦   5 |   10   0 |   10   0 |    5   0 | 2688   * |   2  1 |   1  2
. . . o3o3x4x ♦  64 |   96  32 |   64  24 |   16   8 |    * 280 |   0  3 |   0  3
--------------+-----+----------+----------+----------+----------+--------+-------
. o3o3o3o3x . ♦   6 |   15   0 |   20   0 |   15   0 |    6   0 | 896  * |   1  1
. . o3o3o3x4x ♦ 160 |  320  80 |  320  80 |  160  40 |   32  10 |   * 84 |   0  2
--------------+-----+----------+----------+----------+----------+--------+-------
o3o3o3o3o3x . ♦   7 |   21   0 |   35   0 |   35   0 |   21   0 |   7  0 | 128  *
. o3o3o3o3x4x ♦ 384 |  960 192 | 1280 240 |  960 160 |  384  60 |  64 12 |   * 14
```