Answer
$OU = \frac{2}{\sqrt{3}}$
Work Step by Step
$\frac{OS}{OU} = cos ~30^{\circ}$
$\frac{OS}{OU} = \frac{\sqrt{3}}{2}$
$OU = \frac{2~(OS)}{\sqrt{3}}$
$OU = \frac{2~(1)}{\sqrt{3}}$
$OU = \frac{2}{\sqrt{3}}$
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