∠1 and ∠2 form a linear pair.m∠1 + m∠2 = 180°
∠2 and ∠3 form a linear pair.m∠2 + m∠3 = 180°
∠1 and ∠3 are both supplements of ∠2.So ∠1 ≅ ∠3.(Congruent Supplements Theorem)
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