Answer
Yes
Work Step by Step
They must also be supplementary because HL and JK are parallel therefore the same side interior angles of any transversal that passes through them will be supplementary.
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 4 - Section 4.4 - The Trapezoid - Exercises - Page 209: 8
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