In graph theory, a graph is a network of lines, called edges, and points where they meet, called vertices. Century-old math puzzle. After 122 years, a team of mathematicians has finally solved the ...

Henry Dudeney, a self-taught English mathematician and puzzle columnist, asked his readers to dissect an equilateral triangle into the smallest number of pieces that could be rearranged into a square.

Then, these are moved around to fit into the same triangle, but with an extra open square right in the middle. (If you haven’t looked at the puzzle yet, click here .) Ready for the Solution?

The Missing Square Puzzle shows our rendition of a popular geometric conundrum. First, you see a right triangle made of four distinct shapes. Then, these are moved around to fit into the same ...

A London-based dentist has uncovered a hidden detail in Leonardo da Vinci ’s famous Vitruvian Man drawing, revealing a ...

Jonathan Blow’s latest open-world puzzle game can be tricky at times. Half of The Witness’s difficulty comes from learning the rules of the island’s geometric language.Why are these squares ...

Sliding-coin puzzles in which coins are arranged in a square lattice rather than in a triangular, closely packed one and constrained to move along the lattice are much less common and present ...