The proofs for the each properties?
Properties:
1) Both pairs of opposite sides are parallel.
2) Both pairs of opposite angles are congruent.
3) Both pairs of opposite sides are congruent.
4) Diagonals bisect each other.
5) Consecutive angles are supplementary.
6) All 4 angles are congruent.
7) Diagonals are congruent.
8) All 4 sides are congruent.
9) Diagonals are perpendicular.
10) Exactly* 2 pairs of consecutive congruent sides.
11) Exactly* 1 pair of opposite congruent angles.
12) Exactly* 1 diagonal bisects the other diagonal.
13) Exactly* 1 pair of parallel sides.
14) Exactly* 2 pairs of consecutive angles are supplementary. (NOT the same as #5).
15) Exactly* 1 pair of congruent opposite sides.