The Didrafter Fish

In March 2020, puzzle designer Christoph Lohe asked me how to fit the 13 proper and extended didrafters compactly on a page. Didrafters are formed by joining two 30°-60°-90° right triangles at their legs, hypotenuses, or half hypotenuses.

On April 1 I sent Chris the fish (poisson) shown above. It uses all 13 didrafters, it has no holes, and it fits compactly in its bounding rectangle.

Later I found that the didrafters will fit into a smaller rectangle in many ways. Here is one:

See also Convex Shapes from the 13 Didrafters.

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Col. George Sicherman [ HOME | MAIL ]