Acronym tridex Name tri-icositetradiminished hexacosachoron,tetragonal-antiwedge heptacontadichoron Circumradius (1+sqrt(5))/2 = 1.618034 Dual bidex Confer uniform relative: ex   sadi   segmentochora: ikepy   related scaliform: bidex   general polytopal classes: subsymmetrical diminishings Externallinks

This one can be obtained by chopping off the 72 vertices of an ex, which correspond to 3 vertex-inscribed f-icoes. In fact 72 ikepy are to be cut off. But in contrast to sadi those ikepy would intersect here, resulting in bitdi cells instead, which also show up some f-sized edges. – Tridex likewise can be obtained from sadi by chopping off the 48 vertices of 2 further vertex-inscribed f-icoes, or from bidex by diminishing at those of 1 such. For more details cf. here.

Incidence matrix

```48 |  3  3  2 |  6   9 |  9  : verf = titdi
---+----------+--------+---
2 | 72  *  * |  3   2 |  5  : x-edges
2 |  * 72  * |  1   2 |  3  : f-edges: trigon-to-trapezium + trigon-to-anitialigned trigon
2 |  *  * 48 |  0   3 |  3  : f-edges: trigon-to-para trigon
---+----------+--------+---
4 |  3  1  0 | 72   * |  2  : xf&#x
3 |  1  1  1 |  * 144 |  2  : ox&#f
---+----------+--------+---
6 |  5  3  2 |  2   4 | 72  : bitdi
```