Geometry: Common Core (15th Edition)

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

Chapter 2 - Reasoning and Proof - 2-3 Biconditionals and Definitions - Lesson Check - Page 101: 3

Answer

Two angles are vertical angles if and only if their sides are opposite rays.

Work Step by Step

Since the definition is reversible it can be written as a biconditional. It is true that two angles whose sides are opposite rays are vertical angles.
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