We asked mathematicians to choose their favorite shapes and surfaces and tell us why they find them so exciting and ...

Inside a barn, three people start to sing a song and dance. ALL: (singing) A square and a rectangle, a circle and a triangle. A square and a rectangle, a circle and a triangle. BOY: If you’re ...

Rectangles, arches, and triangles are the most common shapes used to build big structures. What happens when you push the side of a rectangle? The rectangle is a wobbly, unstable shape.