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Pie x radius squared You must know the radius.
The answer depends on their relative size: is the circle inside the square, the square inside the circle or something else?
The diagonal of the square.
The is not stated that the circle inside the square was the greatest possible circle, so all one can say is 8pi at most.
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.