SOLUTION: how do you know if a quadrilateral is a parallelogram?

Algebra.Com
Question 577047: how do you know if a quadrilateral is a parallelogram?

Answer by jim_thompson5910(35256)   (Show Source): You can put this solution on YOUR website!
A quadrilateral is a parallelogram when it has 2 sets of parallel sides (which are opposite one another)
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