Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter P - Preliminary Concepts - P.1 - Sets and Geometry - Exercises P.1 - Page 7: 17

Answer

$\angle DCE$

Work Step by Step

Since each ray contains point C, we know that this must be the middle letter in the sequence. We also know that letters D and E are in the sequence. It does not matter the order of the 3 letter sequence as long a C, D, and E are in it and so long as C is the middle letter. Thus, angle DCE OR angle ECD are both valid answers.
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