Find the area of a square of radius 84 circumscribed around a circle.

The radius of a circle inscribed in a square is equal to half of its side. This means that the side of this square is equal to twice the radius of the circle around which it is described: a = 84 * 2 = 168.
The area of the square is equal to the square of the side: S = 168 * 168 = 28,224.

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