Answer
angle B = 112°
Work Step by Step
As we in parallelogram, Consecutive angles are supplementary
So, angle A + angle B = 180°
68° + angle B =180°
angle B = 180° - 68°
angle B = 112°
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 11 - Section 11.2 - The Cosine Ratio and Applications - Exercises - Page 504: 39b
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