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



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