Problems

Age
Difficulty
Found: 5

Cutting into four parts. Cut each of the figures below into four equal parts (you can cut along the sides and diagonals of cells).

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Cut the board shown in the figure into four congruent parts so that each of them contains three shaded cells. Where the shaded cells are placed in each part need not be the same.
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A rectangle is cut into several smaller rectangles, the perimeter of each of which is an integer number of meters. Is it true that the perimeter of the original rectangle is also an integer number of meters?

Is it possible to cut a square into four parts so that each part touches each of the other three (ie has common parts of a border)?