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



ProveIt! by Michael Ferraro <mferraro@balstaff.org>.
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