\(\sqrt 5\) is an irrational number which is present in the golden ratio.

It is also the measure of the hypotenuse of a right triangle whose other two sides measuring \(1\) and \(2\) units.

We have also:

\(\sqrt 5 = e^{i\pi}+2\phi\);

\(\sqrt 5 \approx \frac{85}{38}\).

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