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Find the arc length of the arc of circle with a $50$ degree central angle for a circle of radius $9$ in. Leave your answer in terms of ${\pi}$.

$\cfrac {45}{4} {\pi}$ in

$18 {\pi}$ in

$\cfrac {5}{4} {\pi}$ in

$\cfrac {5}{2} {\pi}$ in

$5{\pi}$ in