The additional information needed to determine that ABCD is a parallelogram is: A. AB ≅ CD.
How to Identify a Parallelogram?
One of the criteria for proving that a quadrilateral is a parallelogram is that one of the pairs of opposite sides are congruent and also parallel to each.
We are already given that side AB is parallel to side CD, therefore, the additional information we would need to prove that quadrilateral ABCD is a parallelogram is: A. AB ≅ CD.
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