Sal proves that opposite angles of a parallelogram are congruent.
Quadrilateral angles is a free educational video by Khan Academy.It helps students in grades 7 practice the following standards 7.G.B.5.
1. 7.G.B.5 : Use facts about supplementary, complementary, vertical, and adjacent angles in a multi-step problem to write and solve simple equations for an unknown angle in a figure. .
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