Flashcards: Prove Parallelogram Theorems: CCSS.Math.Content.HSG-CO.C.11

What is known if \(\displaystyle ABCD\) is said to be a parallelogram?

\(\displaystyle \overline{AD}||\overline{BC}\)

Opposite side lengths are parallel.

\(\displaystyle ABCD\) is a quadrilateral. 

All of the other answers are correct.

\(\displaystyle \overline{AB}||\overline{CD}\)

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