11 and 12
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± 11.62
The square root of 135 is 11.61895. The two whole numbers closest would be 11 and 12.
11.62
It is: 3 times the square root of 15 or about 11.619 rounded to 3 decimal places
A principal square root is any square root that's answer is positive, and a perfect square root is a square root that's answer is an integer.