Proof: Converse of Parallel Lines 2     
1 and 3 are supplementary
line m line n
1. 
1. 
line m line n
2 = 3
1 + 2 = 180
1 + 3 = 180
1 and 2 are supplementary
1 and 3 are supplementary



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