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2. opposite angles are congruent

3. consecutive angles are supplementry

4. if one angle is left all angles are left

5. diagonals of a parallelogram bisect each other

Opposite angels are congruent (D = B).

Consecutive angles are supplementary (A + D = 180°).

If one angle is right, then all angles are right.

The diagonals of a parallelogram bisect each other.

Each diagonal of a parallelogram separates it into two congruent triangles.