A LINEAR foot can be considered to have either 0 or infinite width so either no matter how many you have you'll never cover 529 SQUARE feet, or such an infinitely small (as near to nothing as makes no odds) amount of them are needed.
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529 sq m = 5694.11 sq feet (to 2 dp)
It is: 23 times 23 = 529 square feet
The square root of 529 = ± 23
It is: 4*pi*11.5squared = 529*pi square feet
Area of a circle = (pi) x (Radius)2Radius = 1/2 of the diameter = 23-ft in this oneArea = (pi) x (23)2 = 529 pi = 1,661.9 square feet(rounded)