Assuming that the area in question is rectangular and that the length is the larger dimension, length ≥ 16 metres and so the length is nearer to 20m.
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256 squared is 65,536.
16 squared is 256.
The area of a square is given by multiplying length by width. Since these are equal, it is the length-squared. Thus, if the area is 256^2 square feet, then the length must be 256 ft. On the other hand, if your question is: Area = 256 sq ft., what is the length? Then the answer is 16 ft. This, by the way, is the relevance of the square root in geometry.
16 16 x 16 = 256
256.