Proof: Triangle Sum Theorem 1     
N = 42
L = 116
M = 22
1. 
1. 
L = 116
M = 22
42 + M + 116 = 180; M + 158 = 180
L + M + N = 180
N = 42



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