Answer
AB and CD must be congruent.
Work Step by Step
AB and CD must be congruent so that the board will be parallel to the ground.
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 4.2 - The Parallelogram and Kite - Exercises - Page 194: 17
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