Two identical squares are attached to each other so that you get a rectangle.

Two identical squares are attached to each other so that you get a rectangle. The perimeter of this rectangle is 42 cm. Find the perimeter of the square.

1. Let’s say one side of a square is x centimeters. The width of the rectangle is equal to this side.

2. So the length of the resulting rectangle is x * 2 = 2x centimeters.

3. Using the formula for determining the perimeter of a rectangle p = (a + b) * 2, we calculate the length of the side of the square.

42 = (2x + x) * 2;

42/2 = 3x;

x = 21/3 = 7 centimeters.

4. Find out what the perimeter of the square is.

7 * 4 = 28 centimeters.

Answer: 28 centimeters.