Answer
$165.853^{\circ}$
Work Step by Step
$165^{\circ}51'09''=165^{\circ}+\frac{51}{60}^{\circ}+\frac{09}{3600}^{\circ}$
$=165^{\circ}+0.85^{\circ}+0.0025^{\circ}=165.853^{\circ}$
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