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OpenStudy (anonymous):
Given: <1 and <2 are supplementary AD=BC Prove: ABCD is a parallelogram.
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OpenStudy (anonymous):
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OpenStudy (anonymous):
Please help!
OpenStudy (mertsj):
Is this supposed to be a formal 2 column proof?
OpenStudy (anonymous):
yes.
OpenStudy (anonymous):
And I know how to write proofs, I just don't know how to prove that it's a parallelogram, I don't know where to start with just those two pieces of info
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OpenStudy (mertsj):
If angle 1 and 2 are supplementary, then AD //BC because if same side interior angles are supplementary, then the lines are parallel.
OpenStudy (anonymous):
Oh!!!!! Thank you soooo much!
OpenStudy (mertsj):
yw
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