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Geometry 9 Online
OpenStudy (falling_in_katt):

https://gordon.owschools.com/media/o_anageo_ccss_2014/2/img_geou04l20_13.gif Parallelogram ABCD contains two congruent triangles. In two or more complete sentences, use the triangles to prove opposite sides are congruent in parallelogram ABCD.

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