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Math Puzzle: Dissect the Square

https://www.profitableratecpm.com/f4ffsdxe?key=39b1ebce72f3758345b2155c98e6709c

Draw four lines beginning and ending at the gray points to break this square into pieces that can be rearranged into five identical squares.

Bonus: Suppose you can use any number of lines that begin and end anywhere along the edge. What other quantities of identical squares can you make with no extra pieces left over?
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