Answer
98.1°
Work Step by Step
Two angles are Supplementary if the sum of their measures is 180°.
The supplement of a $81.9°$ angle is an angle whose measure is $180°-81.9° = 98.1° $
To check, notice that $81.9° + 98.1°= 180°$.
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.