what degree is tangent 0.217

Yep.... about 12.24°

Be aware that it also might be a 3rd quadrant angle because the tangent is also positve there....i.e., 192.24°

Not quite sure about this so if anybody could confirm please do so.

The opposite of tan is $${atan}\left($$ or tan-1

So the calculation is atan(0.217)=12.24