How do you find the missing measurement of a parallelogram?

!.Opposite sides are congruent (AB = DC).
2.Opposite angles are congruent (D = B).
3.Consecutive angles are supplementary (A + D = 180°).
4.If one angle is right, then all angles are right.
5.The diagonals of a parallelogram bisect each other.
6.Each diagonal of a parallelogram separates it into two congruent triangles.

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