Dudeney’s original solution for transforming an equilateral triangle into a perfect square ... and puzzles from the point of view of theoretical computer science. Tonan Kamata is mainly ...

In 1907, the English author and mathematician Henry Ernest Dudeney posed a puzzle: Can any equilateral triangle be cut into as few pieces as possible that will fit together to form a perfect square?

The beginning of spring in the Northern Hemisphere and autumn in the Southern Hemisphere is marked by the vernal equinox — the point ... form an equilateral shape — the Winter Triangle.

These are set up in an equilateral triangle arrangement ... passing through it to focus on a point in space above the whole contraption. To make the display interactive, [Mac] used a trio of ...