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:<math>\sqrt{x} = x^{\frac{1}{2}}</math>
 
The square root [[Fungsi (matematik)|functionFungsi]] generallyakar mapskuadrat umumna metakeun [[rational number|rationalwilangan numbersrasional]] toka [[algebraic number|algebraicwilangan numbersaljabar]]; &radic;''x'' is rational if and only if ''x'' is a rational number which, after cancelling, is a [[fraction (mathematics)|fraction]] of two [[perfect square|perfect squares]]. In particular, &radic;2 is [[irrational number|irrational]].
 
In [[geometry|geometrical]] terms, the square root function maps the [[area]] of a [[square]] to its side length.
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