Final answer:
To determine if quadrilateral ABCD is a parallelogram, we need to check if both pairs of opposite sides are parallel.
Step-by-step explanation:
A quadrilateral ABCD is a parallelogram if both pairs of opposite sides are parallel and equal in length.
To determine if quadrilateral ABCD is a parallelogram, we need to compare the lengths of its sides and check if opposite sides are parallel.
If side AB is parallel to side CD, and side BC is parallel to side AD, then quadrilateral ABCD is a parallelogram.
Similarly, if side AC is parallel to side BD, and side AB is parallel to side CD, then quadrilateral ABCD is also a parallelogram.
Therefore, to determine if quadrilateral ABCD is a parallelogram, we need to check if both pairs of opposite sides are parallel.
Based on the given information, we cannot determine if quadrilateral ABCD is a parallelogram or not as the orientation of the fourth side, D, is not provided.