The Cross and the Triangle
Cut a Greek cross into six pieces that will form an equilateral triangle. This is another hard problem, and I will state here that a solution is practically impossible without a previous knowledge of my method of transforming an equilateral triangle into a square (see No. 26, "Canterbury Puzzles").
Its source prints no answer for this problem, so there's nothing to check against.
H. E. Dudeney, Amusements in Mathematics (1917) · No. 144
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