\overleftrightarrow{AB} AB
A, B, with, \overleftrightarrow, on top and \overleftrightarrow{CD}
CD
C, D, with, \overleftrightarrow, on top are parallel lines. OOO is the midpoint of segment BCBCB, C.

What theorem can we prove by rotating the plane 180\degree180°180, degree about point OOO?

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