Prove that ABCD is a parallelogram, given that ABCD is a quadrilateral with BC parallel to AD and BC=AD.
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Prove that ABCD is a parallelogram, given that ABCD is a quadrilateral with BC parallel to AD and BC=AD.

[From: ] [author: ] [Date: 11-05-04] [Hit: ]
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How do I prove ABCD is a quadrilateral given the information above?

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This is a standard property and you can the proof in any standard text book on Plane Geometry.
Join on diagonal and prove that the triangles are conguent.
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