Definition of a Parallelogram
1) Let's fill in the 2nd row of that table since we know that
Statement Reason
1. ABCD is a parallelogram Given
2. AB ≅ CE Given
3. CD ≅ AB Definition of a Parallelogram
Note that a parallelogram has 2 pairs of congruent and parallel line segments.
2) Thus, the answer is:
"Definition of a Parallelogram".