The sum of the perimeters of a rectangle and a square is cm. Given that the dimensions of the rectangle are cm and cm, determine the side length of the square.
First, use the formula for the perimeter of a rectangle to find the rectangle's perimeter.
To find the perimeter of the square, subtract the perimeter of the rectangle from the sum of the two perimeters.
To find the side length of the square, divide the perimeter of the square by 4.