1. both pairs of opposite sides are congruent.
2 consecutive angles of a parallelogram are supplementary.
3. I don't remember what this one would be
4.the diagonals of a parallelogram bisect each other.
5. opposite sides of a parallelogram are not only parallel but also congruent.
6.opposite angles of a parallelogram are congruent.
I'm so sorry I didn't see this sooner
Explanation: