Answer
$\frac{11\pi}{6}$ rad.
Work Step by Step
Using the fact that $\pi \: \textrm{rad.} = 180^\circ$, $$330^\circ \cdot \frac{\pi \: \textrm{rad.}}{180^\circ}=\frac{33\pi}{18}=\frac{11\pi}{6}$$
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