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Dudeney's 120-year-old dissection puzzle solution proves optimal

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?
Science Daily

Researchers successfully prove the solution to Dudeney's 120-year-old dissection puzzle

Over 120 years ago, 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 ...
insider.si.edu

Geometric Model by A. Harry Wheeler, Equilateral Triangle Transformable into Square, Plane Dissection

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. The four pieces of this model may be ...
insider.si.edu

Square Transformable into an Equilateral Triangle, Plane Dissection (Incomplete)

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This crude, unpainted, incomplete ...