#### Answer

Parallelogram

#### Work Step by Step

AB is parallel to DC (and to the x-axis) and they are equal.
The length of AB is $x_{B}-x_{A}=a-0=a$
The length of DC is $x_{D}-x_{C}=a+b-b=a$

Published by
Brooks Cole

ISBN 10:

ISBN 13:

Parallelogram

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