Enneagonal ditetragoltriate

The enneagonal ditetragoltriate is a convex isogonal polychoron and the seventh member of the ditetragoltriates that consists of 18 enneagonal prisms and 81 rectangular trapezoprisms. However, it cannot be made uniform. It is the first in an infinite family of isogonal enneagonal prismatic swirlchora.

Using the ratio method, the lowest possible ratio between the longest and shortest edges is 1:$$1+{\sin\frac\pi9}\sqrt{2}$$ ≈ 1:1.48369.