Explain that the circumference and height of the bottom of this cuboid are equal;

Because the bottom is also a square, it means that the perimeter of the bottom is the perimeter of the square, so the perimeter and height of the square are equal, and the perimeter of the square is four times the side length of the square, so the height of the cuboid is four times the side length of the square, that is, the side length of the square is the height of the cuboid.

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four

And answer accordingly.

Solution: solution: expand the side of a cuboid to get a square, indicating that the perimeter and height of the bottom of this cuboid are equal;

If the bottom is also a square, according to the formula of the perimeter of the square: c=4a, that is, the perimeter of the square is four times the side length.