Well, honey, the square root of 66 in radical form is just that - the square root of 66. Ain't no simplifying that bad boy any further. So, grab a calculator if you want a decimal, but don't expect any fancy tricks with this one.
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66
approximately .66 repeating
Square root 66 = ± 8.124038404636
1 over 2 times radical 6
It cannot be simplified.