Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Appendix F - Exercise Set - Page 1012: 10



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 $81.9° + 98.1°= 180°$.
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