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If every positive number has two square roots and you can find of the side of a square window by finding a square root of the are, why is there only one answer for the length of a side?

User Gedii
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Every positive number has two square roots - a positive and a negative (unless the value is 0).
The length of something can only be a positive number and since there is only one positive square root, there is only one answer.
User Tomek Klas
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