A hobbyist in the U.K., David Smith, has come up with a brand-new 13-sided shape. It's called the hat because it kind of looks like a fedora. And it's what's known as an Einstein tile.

Shape A, B and C all have 4 sides and 4 corners, but can you see that Shape D has 5 sides and 5 corners. This is the odd one out. A shape with 5 sides and 5 corners is called a pentagon .

Mathematicians Discovered a New 13-Sided Shape That Can Do Remarkable Things. It will tile a plane without ever repeating. By Tim Newcomb Published: Mar 24, 2023 12:00 PM EDT. 2.

Good morning. I'm Sacha Pfeiffer with big news for geometry enthusiasts. A hobbyist in the U.K., David Smith, has come up with a brand-new 13-sided shape. It's called the hat because it kind of ...