Answer
24 degrees
Work Step by Step
We know that angle ABC is equal to the sum of angle ABD and angle DBC. Thus, we find:
$$ 63^{\circ} = 39 ^{\circ} + \angle DBC \\ \angle DBC = 24 ^{\circ}$$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter P - Preliminary Concepts - Chapter P Review Exercises - Page 29: 41
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