Answer
$\frac{2}{3}$
Work Step by Step
We know that $\sqrt (\frac{4}{9})=\frac{2}{3}$, because $(\frac{2}{3})^{2}=\frac{2}{3}\times\frac{2}{3}=\frac{2\times2}{3\times3}=\frac{4}{9}$.
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