SOLUTION: how do you prove quadrilaterals to be parallelograms? I am just looking for a few ways.

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Question 357957: how do you prove quadrilaterals to be parallelograms? I am just looking for a few ways.
Found 2 solutions by ewatrrr, solver91311:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


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) About Me  (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

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