Hi,

a few ways to prove a quadrilateral is a parallelogram:



Proving one of the following to be true:

1) Opposites sides are parallel. 

2) Opposite angles are congruent 

3) Diagonals bisect each other. 

 

Answer by solver91311(24713)   (Show Source): You can put this solution on YOUR website!
 





Given quadrilateral ABCD:











If 





 and  





then ABCD is a parallelogram.





OR if





 and 





then ABCD is a parallelogram.





OR if





 and 





then ABCD is a parallelogram.





OR if





 bisects  and  bisects 





then ABCD is a parallelogram.





John



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



 

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