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: 15



Work Step by Step

The angle of a triangle is 180 degrees. First, you add 11˚ and 79˚ together, which equals 90˚. The next step is to minus 90 from 180, which gives you the answer of 90˚.
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