what is the square root of 0.2?

.2  is    2/10     so it could be  sqrt2/sqrt10     or  .4472135  according to the CALCULATOR on this website....LOL

Exact value of sqrt(0.2)

$\qquad\sqrt{0.2} \\=\sqrt{\dfrac{1}{5}}\\ =\dfrac{1}{\sqrt5}\\ =\dfrac{\sqrt5}{5}$