The perimeter of the polygon is 5 cm long and 3 cm wide.

Let’s remember that the perimeter of a figure is the sum of all its sides. We calculate the perimeter by adding all the sides together and denoting it with a capital letter R.
P = 5 cm + 3 cm + 5 cm + 3 cm = 8 cm + 8 cm = 16 cm.
Or we find out the perimeter of the figure in another way, multiplying its length and width by two with the sum of the found numbers:
P = (5 cm * 2) + (3 cm * 2) = 10 cm + 6 cm = 16 cm.
To summarize: the perimeter is 16 cm.