Proof: Parallelogram 5     
GHJK
GHJ = 60
line JKL
LKG = 120
1. 
1. 
GHJ = 60
180 = LKG + 60
JKL = LKG + JKG
GHJK
JKG = 60
JKL = 180
GHJ = JKG
120 = LKG
line JKL



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