H. E. Dudeney, Amusements in Mathematics (1917) No. 145 · Puzzles · Geometrical puzzles
The Folded Cross
Cut out of paper a Greek cross; then so fold it that with a single straight cut of the scissors the four pieces produced will form a square.
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H. E. Dudeney, Amusements in Mathematics (1917) · No. 145
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