Thinking Mathematically (6th Edition)

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

Chapter 10 - Geometry - Chapter Summary, Review, and Test - Review Exercises - Page 680: 8

Answer

$65^o$

Work Step by Step

The two angles are supplementary as they form a straight line together. This means that the sum of their measures is 180 degrees. Thus, the measure of the angle marked by a question mark with a degree symbol is: $=(180 -115)^o \\=65^o$
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