SOLUTION: how do you tell if opposite sides of a parallelogram are congruent in coordinate proofs?

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Question 486006: how do you tell if opposite sides of a parallelogram are congruent in coordinate proofs?
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!

Use the Euclidian Parallel Postulate and the proof of its converse.
John

My calculator said it, I believe it, that settles it
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