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m∠2 + m∠3 + m∠4 = 180°/ reason: Given?

m∠1 + m∠2 = 180°/reason: Supplementary Angle definition

m∠1 + m∠2 = m∠2 + m∠3 + m∠4/reason: Substitution property equality

m∠1 + m∠2 - m∠2 = m∠2 + m∠3 + m∠4 -m∠2/reason= Subtraction property equality

m∠1 = m∠3 + m∠4/reason: simplify

Please check? I'm not sure about 1&5

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  1. If m∠1+m∠2=180∘ and m∠2+m∠3=180∘, which statement is always true?

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