Acronym	tasa
Name	truncated hepteract
Circumradius	sqrt[19+12 sqrt(2)]/2 = 2.998773
Inradius wrt. hop	(7+6 sqrt(2))/sqrt(28) = 2.926443
Inradius wrt. 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°
Face vector	896, 3136, 5152, 5040, 2968, 980, 142
Confer	general polytopal classes: Wythoffian polyexa   analogs: truncated hypercube tCn
External links

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