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Which shape has congruent diagonals Videos

Proof: a rectangle's diagonals are congruent.

Prove theorem: If a parallelogram is a rectangle, then its diagonals are congruent.

User Comments

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Andrew Hedman commented on 13 Jan 2015
keep a roll on whiteout with you. No scratch outs, and you don't have to wait for it to dry. 
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tadi kumar commented on 18 Dec 2015
If the diagonals of a parallelogram are equal, then show that it is a rectangle.
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K Lovell commented on 05 Feb 2015
For the last reason of why AC=BD should be CPCTC not just CP
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Angela L commented on 09 Dec 2015
THANK YOU!!!!:)
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Misaki Tsukada commented on 31 Mar 2015
i love you 
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Abdul Gamoranao commented on 31 Aug 2013
thank you..

Proof Rectangles Have Congruent Diagonals

A proof to show that rectangles have congruent diagonals.

Rhombus diagonals | Quadrilaterals | Geometry | Khan Academy

Proof that the diagonals of a rhombus are perpendicular bisectors of each other Watch the next lesson: ...

User Comments

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Overclock commented on 03 Mar 2011
@PlzHelpwithname good job, you know the world doesn't revolve around you, just because you already know everything in the video doesn't mean the whole class doesn't have to watch it or your teacher has to tell you not to watch it
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PlzHelpwithname commented on 14 Feb 2011
had to watch this for my Geometry class... i dont really know why tho, i didnt learn anything i didnt know
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DeluxeWarPlaya commented on 08 Jan 2011
How to win at youtube: step 1: Change your name to Sal Khan step 2: Analyse a rhombus to death
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Hadiyah Hanifi commented on 14 Oct 2011
im the smartest kid in the world THE END. BY PLZHELPWITHNAME
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Pokesports commented on 29 Mar 2011
@PlzHelpwithname your mother would be proud
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nhmllr725 commented on 07 Jan 2011
huh... Never really thought about this...
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MixesAndStuff commented on 26 Feb 2011
@PlzHelpwithname no one cares
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Lawson English commented on 10 Jan 2011
test

Proof: Opposite angles of parallelogram congruent | Quadrilaterals | Geometry | Khan Academy

Showing that opposite angles of a parallelogram are congruent Practice this lesson yourself on KhanAcademy.org right now: ...

User Comments

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Rony Biram commented on 31 Oct 2011
What category can I find these vids under? I would like to start from the beginning!
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BOS521 commented on 31 Oct 2011
@1sanak Geometry
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