Question

In quadrilateral ABDC, AB // CD. Which additional piece of information is needed to determine that ABDC is a parallelogram? overline AB cong overline CD O overline AC cong overline BD OAB overline AB perp overline BD; overline CD perp overline BD

Answer 1

AC is parallel to BD

Explanation:

A parallelogram is a quadrilateral with two pairs of parallel sides.