Square Calculator
A = s² | P = 4s | d = s√2
The square root of a number x is a value r such that r² = x. Every positive number has two square roots: a positive (principal) root and a negative root. Only zero has a single square root: zero itself.
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Tip: To check your answer: square it. If r = √x, then r² should equal x exactly.
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Fun Fact
The ancient Babylonians calculated square roots using a method equivalent to Newton's method around 1700 BC — over 3,500 years ago.
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