Finding the square root of it.
Taking the square root.
Not squaring it.
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using n to represent the number. n^2 when squared rooted equals the original number, n; and when a number squared rooted is squared, it also equals to the original number. Hence the relationship is, when either of the operations is applied to the opposite operation (i.e. n^2 is opposite to square root of n) is result is always the original number, n. Hope I didn't confuse you too much :)
pythagrem therom a squred + b squared =c squared
Squared. E.g the square root of 4 is 2, and 2 squared is 4.
A number squared means that the number is multiplied by itself.
If a number is to the power of 2 it is "squared". The number that is squared is the "root".