It's between 9 and 10. If you need an exact number, you're using a computer to access this web site; perhaps it might be of some use?
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± 27.037012
The square root of 180 = 13.41640786499874
It is an irrational number and it is about 10.536 rounded to 3 decimal places
The square root of 100 km^2 is 10 km.
81 -- 8+1 = 9 -- square root of 81 = 9