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

Henry Ernest Dudeney posed the famous dissection problem of transforming a triangle into a square by cutting it into as few pieces as possible. In a new study, researchers have finally proved that the ...

The second puzzle appears to be a complicated geometrical ... Start with the two large triangle pieces and place them to fit each edge of the pattern. Place the rectangle on a lone space below.