#### 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.

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Published by
Brooks Cole

ISBN 10:
9781285195698

ISBN 13:
978-1-28519-569-8

AB and CD must be congruent.

AB and CD must be congruent so that the board will be parallel to the ground.

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