Proof - Diagonals of a Parallelogram Bisect Each Other

Learn more: http://www.khanacademy.org/video?v=TE...
Proving that a quadrilateral is a parallelogram if and only if its diagonals bisect each other

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[rhoadess]

In the video, we can see he meant ∠DCE ≅ ∠BAE, but it's good to point out the error.

[Nekit1234007]

“∠DEC ≅ ∠BAE” — false

[Nikhil JOHN]

hey man ur awesome but i cant find perimeter and area of pane figures can u plz send me da video link plzzz

[michaelcabral1575]

stop being so imature. It's an educational video

[reevesssy]

Watching cause your exam is tomorrow... awks

[ammvid]

Sorry but your voice is boring, I thought you'd be good since I saw you on TV!

[Drake Whyte]

STUPID

[Drake Whyte]

boring

[skitterrusty]

Unless you write out the proof for how the sides of the parallelogram are equal you can't use that data. It's a well known property of a parallelogram, but so is how the diagonals bisect so you can't use it as reasoning. It's much easier and better to use ∠AEB = ∠CED (vert. opp. ∠'s).

[QUITEthegamer]

Thanks. This really helped me.