Sam Z. answered 03/01/21
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It can't be proved. The 2 lines can be an X.
Sam Z.
All I can think of is if bd and cd are = in length; They're cut in half. The 4 legs are =; so the sides ab, cd are ∥.
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03/01/21
Nicole W.
In the diagram line AB and line cd are parallel03/01/21