The perimeter of the square is 12 cm From two such squares we made a rectangle. Find the perimeter of the rectangle.

The perimeter is the sum of all sides, for a square all sides are equal, so the side of the square is 12: 4 = 3cm.
In a composed rectangle, two sides are the same as in a square of 3 cm, and two are made up of the sides of a square 3 + 3 = 6 cm.
Find the perimeter of the rectangle:
3 + 3 + 6 + 6 = 18cm.
Answer: the perimeter of the rectangle is 18 cm.