SOLUTION: How do I prove ABCD is a quadrilateral?
Algebra.Com
Question 42676: How do I prove ABCD is a quadrilateral?
Answer by rajagopalan(174) (Show Source): You can put this solution on YOUR website!
How do I prove ABCD is a quadrilateral?
A simple proof will be
AB+BC >AC and
AD+DC>AC
combined with AB, BC,CD,DA each >0.
Good luck.
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