Answer
57 degrees
Work Step by Step
We know that angle ABC is equal to the sum of angle ABD and angle DBC. Thus, we find:
$$\angle ABC = 31^{\circ}+26^{\circ} \\ \angle ABC = 57 ^{\circ}$$
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: 40
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