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: 8


$m\angle{HAF} = 50^o$ The angle is acute.

Work Step by Step

point H is at $180^o$ point F is at $130^o$ Thus, $m\angle{HAF} =180^o-130^o=50^o$ Acute angles are angles whose measure is less than 90 degrees. Thus, $\angle{HAF}$ is acute.
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