Answer
$270^\circ$
Work Step by Step
Using the fact that $\pi \: \textrm{rad.} = 180^\circ$, $$\frac{3\pi}{2} \: \textrm{rad.}\cdot \frac{180^\circ}{\pi \: \textrm{rad.}}=\frac{540}{2}=270^\circ$$
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