Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 1 - Tools of Geometry - 1-5 Exploring Angle Pairs - Practice and Problem-Solving Exercises - Page 39: 36


$m\angle ACE=115$

Work Step by Step

Use the definition of a linear pair: $m\angle ACE+m\angle ACB=180$ $m\angle ACE+65=180$ $m\angle ACE+65-65=180-65$ $m\angle ACE=115$
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