Answer
$2.11$ radians
Work Step by Step
First convert the angle to decimal degrees:
$120^{\circ}40'=120^{\circ}+(\frac{40}{60})^{\circ}=120.67^{\circ}$.
Now convert to radians:
$120.67^{\circ}=120.67(\frac{\pi}{180})\approx2.11$ radians.
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