Answer
$\angle AOD\cong\angle BOC$
$\angle AOB\cong\angle DOC$
Work Step by Step
The Vertical Angle Theorem tells us these pairs are congruent.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 2 - Reasoning and Proof - 2-6 Proving Angles Congruent - Practice and Problem-Solving Exercises - Page 126: 20
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