
You can divide this diagram into three parts and arrange them into squares. Parts should not be folded back to front, overlap, or have any gaps in the square.
For simplicity, assume that each side of the small square has length 1. This diagram consists of 25 small squares, so the final square must have a side length of 5. In this case, small 5 x 5 squares are available, but there is no proper way to separate them along the grid lines. However, the instructions do not prohibit cuts that are not along the square grid. Using the Pythagorean theorem, we can verify that the length of the two diagonal cuts below is 5.

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This puzzle was originally Wissenschaft spectrum Reprinted with permission.