Answer
$4.47$ radians
Work Step by Step
First convert the angle to decimal degrees:
$256^{\circ}20'=256^{\circ}+(\frac{20}{60}^{\circ})=256.33^{\circ}$.
Now convert to radians:
$256.33^{\circ}=256.33(\frac{\pi}{180})\approx4.47$ radians.
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