Haberdasher's Problem
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A square is cut into four pieces that can be rearranged to form an equilateral triangle. Henry Dudeney published this puzzle in 1902.
Contributed by: George Beck (October 2007)
Open content licensed under CC BY-NC-SA
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"Haberdasher's Problem"
http://demonstrations.wolfram.com/HaberdashersProblem/
Wolfram Demonstrations Project
Published: October 24 2007