If the perimeter of a rectangle is 60 cm, then can the length of one of the sides of this rectangle be equal to 30 cm?

The perimeter of a rectangle has four sides (two widths and two lengths).
Since the entire perimeter is 60 centimeters, the sum of its two sides cannot be greater than or equal to 60 centimeters.
Provided that one of the sides of the rectangle is 30 centimeters, then the sum of its two sides will be equal to 60 centimeters.
Therefore, one side of a rectangle with a perimeter of 60 centimeters cannot be equal to 30 centimeters.