Answer
90°
Work Step by Step
Two angles are Supplementary if the sum of their measures is 180°.
The supplement of a $90°$ angle is an angle whose measure is $180°-90° = 90° $
To check,notice that $90° + 90°= 180°$.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Appendix F - Exercise Set - Page 1012: 8
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