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



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