Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 2 - Section 2.1 - The Parallel Postulate and Special Angles - Exercises - Page 80: 27b

Answer

180$^{\circ}$

Work Step by Step

The sum of angles 1, 4, and 5 is 180$^{\circ}$ because they meet to form a straight line.
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