Multiply (the length of any side) by (the length of any side).
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Multiply the length of one side by itself !
4 of them.
It ultimately depends on the areas of the two shapes: Acircle = pi*r2 Asquare = l2 Fraction shaded = Acircle / Asquare = pi*r2/ l2 If the circle fills the square (e.g. l=2r) then the formula simplifies considerably: pi*r2/4r2 = pi/4
The square numbers are: 16-4 = 12
To find the perimeter you add and to find the area we multiply.