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 (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Chapter 1 - Section 1.4 - Angles and Their Relationships - Exercises - Page 35: 6
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