You could find some numbers that square to numbers close to 45.
6 squared is 36, and 7 squared is 49, so you know it is between 6 and 7 but closer to 7.
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3 times the square root of 5
It is 2*sqrt(5).
About 6.71 meters.
15 square root sign 5
6^2 is 367^2 is 49so, the square root of 45 is between these two but is an irrational number close to6.708203932