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You use the square root key on a calculator, or the sqrt() function in Excel. If you want to do it without a calculator, there are several methods; one that is fairly straightforward is trial and error: just try squaring different numbers until you get close enough. (Other methods may be faster, but are still iterative - you have to repeat the same steps several times, until you get sufficient precision.)

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11y ago
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Q: How do you square root the area of a square?
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