Hint
Let's take the ratio of a
standard square of side 4. What is the ratio
r = (p^2)/a?
To take the perimeter of a
square we add up all the sides. Since the sides of a square are all the
same we have 4 x (s) where s signifies the measurement of one side.
The area of a square is side x
side or s^2.....
and perimeter squared = (4s)^2
so r=(4s)^2/s^2
=16s^2/s^2
cancelling we get 16....Ta Da...
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