Answer
$\approx103.04$ rad.
Work Step by Step
Since $2\pi$ corresponds to one rotation around the unit circle, $16.4$ rotations equate to $16.4(2\pi)\approx103.04$ rad.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.