Henry Ernest Dudeney posed the famous dissection problem of transforming a triangle into a square by cutting it into as few ...

That's why they're so much fun (and so tricky!) to solve. This triangle puzzle is all about seeing triangles ... inside triangles … inside other triangles. Your goal is to see how many triangles ...

In 1907, the English author and mathematician Henry Ernest Dudeney posed a puzzle: Can any equilateral triangle be cut into ...

Researchers have demonstrated, using a novel approach, that the original solution to Dudeney’s famous dissection problem is ...

What it means is that in a right triangle (where one angle equals 90°), the sum of the squares of two sides equals the square of the hypotenuse (the longest side).