The perimeter of the rectangle is 40 cm and one of its sides is 2 cm. Find the side of the square equal to the great one.

Let us determine through what number of centimeters the other side of our geometric figure is expressed, when from the condition of the task we know that the first is equal to 2 centimeters, with a perimeter of the figure equal to 40 centimeters:

40: 2 – 2 = 18.

Let us determine through what number of square centimeters the area of this figure is expressed:

2 * 18 = 36.

Let us determine through what number of centimeters the side of the square is expressed, if it is known that it is equal in size to the first figure:

√36 = 6.

Answer: The side of the square is 6 cm.