radius is half of the diameter of a circle. Squared means to multiply it by itself.
r2 = r X r
r = radius = 1/2 X diameter
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The square footage of a radius is meaningless, but if you mean the square footage of a circle of radius say R, the answer is 3.142 x R x R
It's hard to say, because "radius" is not a term classically associated with the square. You'd have to define what you mean when you talk about the square's radius.
That's virtually impossible to say until you explain what you mean by the 'radius' of a square.
If you mean square units within a circle then it is:- Area = pi*radius squared
No Radius in a SquareA radius is a feature of a circle, not a square. A square, whatever its area, does not have a radius.