Answer
$\angle{ABC}$, $\angle{ABD}$, $\angle{DBC}$ are all angles in the figure.
Work Step by Step
Both of the smaller angles, as well as the larger angle formed by their union, compose the following figure.
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 1.2 - Informal Geometry and Measurement - Exercises - Page 17: 7
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