Watch the video below which is all about polygons. Polygons are 2D shapes with 3 or more straight sides. All quadrilaterals are polygons, but there are other types of polygons too. As you can see ...

For all Ellenberg’s wit and play (and his rightful admiration of some excellent 19th-century beards), the real work of “Shape” is in codifying that geometry on the page. Ellenberg butters ...

2D shapes have sides and corners. A rectangle has 4 straight sides and 4 corners. A square is a special type of rectangle, where all 4 sides are the same length. Why not see how much you know ...

The square-derived tiles are more diverse ... elongated dodecahedron and truncated octahedron. All these shapes are polyhedra with flat faces and straight edges. But 3D shapes with curves can ...