Answer
AB and CD are congruent.
Work Step by Step
AB and CD must be congruent so that the board is parallel to the ground when the legs are extended.
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 4 - Section 4.2 - The Parallelogram and Kite - Exercises - Page 185: 18
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