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: 19



Work Step by Step

The sum of the measures of the angles of a triangle is $180°$. Since one angle measures $30°$ and the other angle measures $60°$, the third angle measures $180°-30°-60°=90°$.
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