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1. opposite sides are congruent
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
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Opposite sides are congruent (AB = DC).
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.
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