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 (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 1 - Section 1.2 - Informal Geometry and Measurement - Exercises - Page 18: 7
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