7.4. Can several rectangles, the sum of the perimeters of which is 100, be combined to form a square with a side length of 16?
Answer: Yes.

Solution. Let's take, for example, two rectangles $8 \times 2$ and one rectangle $14 \times 16$ and arrange them as shown in the figure (the size of one cell is $4 \times 4$).

![](https://cdn.mathpix.com/cropped/2024_05_06_e6a70b923c737a617906g-2.jpg?height=288&width=300&top_left_y=1318&top_left_x=1004)