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


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