When in the numerical value of a square's area (in square units) equal to its perimeter (in units)? Why is this true?

Area  = s x s  = s^2

Perimeter = s+ s + s + s = 4s     when are they equal????

 

s² = 4s         divide both sides by 's'

s = 4       When the side length is 4 units    

                          the area and perimeter are the same numerical value  (BUT one has ' units^{2 '}  and the other is just ' units ' )