2D shapes have sides and corners (also called vertices). Here are some 2D shapes you might know. Why not see how much you know about this topic already? Then work through the page and see if you ...

24 permutations of (1,2,3,4), which are the vertices of the 4-permutahedron, a 3D polytope that lives in 4-space. This polytope is actually a truncated octahedron, a shape with 14 sides (six ...