A common childhood toy involves matching geometric shapes, such as triangles, circles and squares, with the corresponding holes in a flat board. Success teaches the child who is using the toy about ...

New work on the problem of “scissors congruence” explains when it’s possible to slice up one shape and reassemble it as another. If you have two flat paper shapes and a pair of scissors, can you cut ...

From tracing triangles to building with blocks, shape learning is more than just fun—it’s the foundation for math, reading, and problem-solving skills. Experts say early exposure to playful, hands-on ...