Nonagon Infinity is, in a word, bonkers. Maddening. Certifiably loopy. And looping: When you've reached the end of its just-over-41-minute run, Nonagon Infinity loops seamlessly back into the first ...

A nonagon has nine sides and a decagon has ten sides. To understand polygons, a good understanding of other angle rules, including triangles and quadrilaterals can be helpful. The word for the name of ...