Proof: Parallelogram 8     
G = JHI
GHJ = GKJ
line GHI
Quadrilateral GHJK is a
1. 
1. 
Quadrilateral GHJK is a
GKJ and G are supplementary
line GHI
180 = GKJ + G
GHI = GHJ + JHI
line GK line HJ
G = JHI
GHI = 180
GHJ = GKJ
line GHI line JKL



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