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



ProveIt! by Michael Ferraro <mferraro@balstaff.org>.
Copyright ©2010. All rights reserved.