Help please, will medal

In quadrilateral ABCD, diagonals AC and BD bisect one another:
http://assets.openstudy.com/updates/attachments/529c4878e4b0d8f0279a78a0-kellydiaz0123-1385974183106-03_04_a40.jpg

What statement is used to prove that quadrilateral ABCD is a parallelogram?

Angles BAD and ADC are congruent.
Corresponding angles BCD and CDA are supplementary.
Sides CD and DA are congruent.
Vertical angles BPA and DPC are congruent.

Question

Help please, will medal

In quadrilateral ABCD, diagonals AC and BD bisect one another:
http://assets.openstudy.com/updates/attachments/529c4878e4b0d8f0279a78a0-kellydiaz0123-1385974183106-03_04_a40.jpg

What statement is used to prove that quadrilateral ABCD is a parallelogram?

Angles BAD and ADC are congruent.
	Corresponding angles BCD and CDA are supplementary.
	Sides CD and DA are congruent.
	Vertical angles BPA and DPC are congruent.

cresciez · Answer

I was thinking D but I'm not sure; proofs have always been my weakest area.

anonymous · Answer

angles BAD and CDA are congruent, I believe

cresciez · Answer

I was considering that one too - I'll tell you if the question is right and I'll give you the medal ^^

anonymous · Answer

ok

cresciez · Answer

Nope it was my answer.

cresciez · Answer

:/

anonymous · Answer

ok sorry i dident know for shure