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In a $30-60-90$ triangle, if the length of the hypotenuse is $1$, then what is the length of the side that is opposite the $60°$ angle?

$\cfrac{1}{2}$

$\cfrac{\sqrt{2}}{2}$

$\cfrac{\sqrt{3}}{2}$

$\cfrac{2\sqrt{3}}{3}$

$\cfrac{\sqrt{3}}{3}$