ANSWER
See explanation
EXPLANATION
In parallelogram, ABCD,
1. The opposite angles are equal
[tex]m \angle \: A= m\angle \: C[/tex]
[tex]m \angle \: B= m\angle \: D[/tex]
2. The adjacent angles are supplementary.
[tex]m \angle \: B + m\angle \:C = 180 \degree[/tex]
etc.
3. The diagonals bisect each other
|AE|=|EC|
|BE|=|ED|
4. The opposite sides are parallel.
[tex]AD\parallel BC[/tex]
[tex]AB\parallel DC[/tex]
5. The sum of all interior angles is 360°
