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Theorem: If the diagonals of a parallelogram are congruent, then each angle of the parallelogram is a right angle. Kim is writing the proof of the theorem using the properties of a parallelogram shown below. • The opposite sides of a parallelogram are parallel. • The opposite sides of a parallelogram are congruent. A parallelogram ABCD with diagonals AC and BD. She proved the theorem by showing that triangle ADC is congruent to triangle CBA using the _________ Postulate.

Mathematics
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Let me read hmmm
Side angle side?
SAS

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Other answers:

Is that what your looking for?
i think so thank-you!
Best answer medal? :P
yep he is right.
haha! theres your medal =)
Thanks lol
mhmm np haha
I think its SSS.... • The opposite sides of a parallelogram are parallel. • The opposite sides of a parallelogram are congruent. they are both talking about sides.............
nvr mind, I found the angle Theorem: If the diagonals of a parallelogram are congruent, then each angle of the parallelogram is a right angle. So I concure with them lol

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