529 sq m = 5694.11 sq feet (to 2 dp)
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Assuming a 23 metre square, the area is 232 = 529 square metres (529 m2).
It is: 23 times 23 = 529 square feet
The square root of 529 = ± 23
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.
It is: 4*pi*11.5squared = 529*pi square feet