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If all pairs of consecutive angles of a quadrilateral are supplementary, then the quadrilateral is a parallelogram.
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If all pairs of consecutive angles of a quadrilateral are supplementary, then the quadrilateral is a parallelogram.

User Bojangles
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2 Answers

2 votes

Answer:

true

Explanation:

User Rrebase
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1 vote
This is true.

It comes from the same side interior angles theorem which says that same side interior angles are supplementary, only if the lines are parallel.
User Viktor Nordling
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