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 (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 4 - Section 4.2 - The Parallelogram and Kite - Exercises - Page 196: 17
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