To find the perimeter of any shape you must add all the sides together.
As a basic rule the sides of a square are all equal to each other. This means that all four of the sides are 5.5
The perimeter of the square is therefore:
5.5 + 5.5 + 5.5 + 5.5 = 22
OR
5.5 * 4 = 22
The perimeter of the square is 22 cm
Hope this helped!
~Just a girl in love with Shawn Mendes