Each side of the square is 4 units in length
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If the side length is s units then the area is s2 square units. So, given the area, take the principal square root.
A square with a side length of 20 units has an area of 400 square units.
If you are given the area, A square units, then each side of the square is sqrt(A) units. And then the perimeter is 4*sqrt(A) units. The smaller square inside is irrelevant.
If the side of the square is s units then the diameter of the circle is s units and so its area is pi*s2/4 square units.
A square with a side length of 12 units has an area of 144 square units.