Tags » Nonagon

Four Polyhedra Featuring Enneagons

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


Tessellation of Blue Triangles and Yellow Concave Pentagons

Alternately, this can be seen as a tessellation of blue diconcave hexagons and yellow triconcave enneagons. Which do you see?