Answer
If $\angle$A and $\angle$B are vertical angles, then those angles are congruent.
Work Step by Step
This is a contrapositive of the given statement.
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 2 - Section 2.2 - Indirect Proof - Exercises - Page 85: 11
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