Evaluate
\frac{\sqrt{5}}{5}\approx 0.447213595
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\frac{4\sqrt{5}}{20}
Factor 80=4^{2}\times 5. Rewrite the square root of the product \sqrt{4^{2}\times 5} as the product of square roots \sqrt{4^{2}}\sqrt{5}. Take the square root of 4^{2}.
\frac{1}{5}\sqrt{5}
Divide 4\sqrt{5} by 20 to get \frac{1}{5}\sqrt{5}.
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