The diameter of a rectangular area is the square root of the length squared plus the width squared. D = √(L²+W²).
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There is no real number [square] root of a negative number. There is a real cube root and a real fiftth root etc, but root, by itself, implies square root.
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The square root of any positive real number (as in this case) is a real number. (Such square roots are usually irrational.)The square root of a negative real number, such as the square root of -15, is an imaginary, and therefore also a complex, number.
electricians use the Square Root function when connecting 3 way outlets with the electral current of an intel processor.
The square root of a negative number is not real.