sqrt(82) = 9.05539 (to 5 dp)
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The square root of 82 cannot be reduced as a surd.
There is no "best" approximation. The square root is irrational and so it is a non-terminating, non-recurring decimal so adding one more digit will always make it a better approximation.
The square root of 6724 is 82
82 is one of the square roots of 6,724.The other one is -82 .
Expressed as a surd, sqrt(738) = 3 sqrt(82). Expressed as a decimal, and rounded to two decimal places, this is equal to ±27.17.