Acronym sidtixhipy, pt || sidtixhi
Name (degenerate) sidtixhi pyramid
Circumradius ∞   i.e. flat in euclidean space
Confer
general polytopal classes:
decomposition  

It either can be thought of as a degenerate 5D segmentotope with zero height, or as a 4D euclidean decomposition of the larger base into smaller bits.

As abstract polytope sidtixhipy is isomorphic to gidtixhipy, thereby replacing gike by ike, resp. gikepy by ikepy and sidtixhi by gidtixhi.


Incidence matrix according to Dynkin symbol

ox3oo3oo3oo5/2*b&#x   → height = 0
(pt || sidtixhi)

o.3o.3o.3o.5/2*b    | 1   *  120    0 | 1200    0 | 2400   0   0 | 600 120 0
.o3.o3.o3.o5/2*b    | * 120 |   1   20 |   20   60 |   60  20  12 |  20  12 1
--------------------+-------+----------+-----------+--------------+----------
oo3oo3oo3oo5/2*b&#x | 1   1 | 120    *    20    0 |   60   0   0 |  20  12 0
.x .. .. ..         | 0   2 |   * 1200 |    1    6 |    6   3   3 |   3   3 1
--------------------+-------+----------+-----------+--------------+----------
ox .. .. ..     &#x | 1   2 |   2    1 | 1200    * |    6   0   0 |   3   3 0
.x3.o .. ..         | 0   3 |   0    3 |    * 2400 |    1   1   1 |   1   1 1
--------------------+-------+----------+-----------+--------------+----------
ox3oo .. ..     &#x  1   3 |   3    3 |    3    1 | 2400   *   * |   1   1 0
.x3.o3.o ..          0   4 |   0    6 |    0    4 |    * 600   * |   1   0 1
.x3.o .. .o5/2*b     0  12 |   0   30 |    0   20 |    *   * 120 |   0   1 1
--------------------+-------+----------+-----------+--------------+----------
ox3oo3oo ..     &#x  1   4 |   4    6 |    6    4 |    4   1   0 | 600   * *
ox3oo .. oo5/2*b&#x  1  12 |  12   30 |   30   20 |   20   0   1 |   * 120 *
.x3.o3.o3.o5/2*b     0 120 |   0 1200 |    0 2400 |    0 600 120 |   *   * 1

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