First of all, there is no reason to suppose that the area is circular as opposed to rectangular or triangular or some other simple or complicated shape. If, on the basis that the question asks for the radius, you assume that it is a rectangle, then the radius is 0.564 km = 564 metres.
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Square root (1 km^2) = 1 km.
1 square mile = 2.59 square km 1 square km = 0.39 square mile
Well, honey, the area of a circle with a 5 km radius is about 78.54 square km. So, if you're looking to throw a party in that space, you've got plenty of room to work with. Just make sure to invite me!
Answer: 1 mi² = 2.58998 km²
A circle with a radius of 126 km has a circumference of 791.68 km.