Answer
$$124^{\circ}$$
Work Step by Step
We know that the angles add to 180 degrees. Thus, the measure of angle 1 is:
$$ m \angle 1 = 180^{\circ}-m\angle 2 \\ m \angle 1 = 180^{\circ}-56^{\circ} \\ m \angle 1 = 124 ^{\circ}$$
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 - P.3 - Informal Geometry and Measurement - Exercises P.3 - Page 24: 39
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