It is 60
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The best approximation is, of course, the exact value. A reasonable approximation is 106.
What approximation is "best" depends on the required level of accuracy.
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.
20.1094005
11.5326