Proof: Supplementary Angles 2     
1 = 35
2 = 145
1 and 2 are supplementary
1. 
1. 
2 = 145
1 = 35
1 + 2 = 1 + 2
1 + 2 = 35 + 145; 1 + 2 = 180
1 = 1
1 and 2 are supplementary



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