Answer
$\angle$7 and $\angle$8 are vertical angles.
Work Step by Step
These two angles, created by intersecting lines, are opposite of each other. Therefore these two angles are vertical angles.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 1 - Section 1.4 - Angles and Their Relationships - Exercises - Page 37: 6
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