squares do not have a radius
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Half the square root of the square radius equals the circle radius.
The same as half the side of the square, as the radius of the circle is half its diameter, and the diameter of the circle is equal to the side of the square.
Radius is the square root of (area divided by pi).
Divide the area by pi and then square root it this will give the radius of the circle.
Area of any circle = pi times radius squared.