Nyquist Criteria describe a systems stability as a function of frequency response. Much like Bode plots do.
Root-locus describe a systems stability as a function of system gain.
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They are the same.
The approx difference is 0.7
The square root of a number is the inverse of the square. For example, three squared equals nine, so the square root of nine is equal to three.
Use Pythagoras' Theorem: calculate the square root of ((difference of x-coordinates)2 + (difference of y-coordinates)2).
The square root of 49 is 7. The square root of 64 is 8. The square root of any number between 49 and 64 is between 7 and 8.