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Answer :

Step-by-step explanation:

See the attached image.  I numbered angles differently so as not to make an assumption that angles numbered the same are congruent.

[tex]\overline{AB} \parallel \overline{CD}\\\angle1 \cong \angle3[/tex] (alternate interior angles are congruent)

[tex]\overline{AD} \parallel \overline{BC}\\\angle 2 \cong \angle 4[/tex] (alternate interior angles are congruent)

[tex]\overline{AB} \cong \overline{CD}[/tex]  (opposite sides of a parallelogram are congruent)

[tex]\triangle{ABO \cong \triangle{CDO}[/tex]  (ASA - side/angle/side)

[tex]\overline{AO} \cong \overline{CO}\\\overline{BO} \cong \overline{DO}[/tex]  (corresponding parts of congruent triangles are congruent)

The diagonals bisect each other!

View image Ivycoveredwalls

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