Enneagons are also called nonagons; they are polygons with nine sides. I used *Stella 4d* to make these four rotating polyhedra, and you may try this program for yourself at… 7 more words

## Tags » Nonagon

#### Four Polyhedra Featuring Enneagons

#### Two Polyhedra, Each Featuring Enneagons and Octagons

I used *Stella 4d: Polyhedron Navigator* to make these. You can try it for yourself at http://www.software3d.com/Stella.php.

#### 02-02

02-02. Fluorite #5.

Strange flower!

This visualization is made from 90, 9 sided atoms. O polyhedra this time. The nonagon is a geometric figure not constructible with compass and straightedges. 29 more words

#### A Polyhedron Made of Enneagons and Pentagons

This polyhedron has 20 enneagons and 12+60=72 pentagons (of two types) as faces. I made it using *Stella 4d*, which is available at http://www.software3d.com/Stella.php.