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Geometry 8 Online
OpenStudy (anonymous):

In the parallelogram ABCD, AM and CN are both perpendiculars to DB. How to prove that ANCM is also a parallelogram?

OpenStudy (anonymous):

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OpenStudy (shubhamsrg):

|dw:1401542250095:dw| Your main aim is proving CN=AM (you already know CN||AM) Can you prove triangles AKM and CKN are congruent ? This should help.

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