Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 10 - Geometry - 10.1 Points, Lines, Planes, and Angles - Exercise Set 10.1 - Page 616: 7


$m\angle{HAB}= 160^o$ $\angle{HAB}$ is obtuse.

Work Step by Step

point H is at $180^o$ point B is at $20^o$ Thus, $m\angle{HAB} =180^o-20^o=160^o$ Obtuse angles are angles whose measure is more than 90 degrees but less than 180 degrees. Thus, $\angle{HAB}$ is obtuse.
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