It is: 4*5 = 20cm
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What does the '5cm' represent??? Is it the length of the perimeter , or are you misunderstanding that the 5 cm is the length of one side. When described as a '5 cm square' is this the 'area'.
20cm/4sides = 5cm 5cm*5cm = 25cm^2
25 cm
If you know only the base and height, you have two unknown sides and it is not possible to calculate the perimeter. The perimeter can have any value greater than or equal to 5+sqrt(89) cm.
you only need to measure 1. say it was a square with a side that's 5cm long then you go 5x4 and you've got the answer: 20cm perimiter!