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: 14



Work Step by Step

The two angles are supplementary, so their sum is 180 degrees. The sum of the unknown angle and the 13-degree angle is 180 degrees. Thus, to find the measurement of the unknown angle, subtract 13 degrees from 180 degrees to obtain: $=(180-13)^o \\=167^o$
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