On the video, the rapper known as 2 Pi reels off rhymes as teenagers in classrooms and hallways sway and bop to the music. It's upbeat. It's catchy. It's . . . math. We solve triangles one by one ...

Triangles are placed on the middle rung of the Squid Game hierarchy – they act as armed soldiers. Throughout the games, the Triangles will be the ones enforcing the rules with guns in hand.

For the Museum of Math's first anniversary. The proof of the Flatiron building's right triangle nature is based on the Pythagorean theorem — the statement that for a right triangle with legs ...