Question

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Answer 1

See below for answer.

Explanation:

∠1 and ∠2 are supplementary Given

∠1 + ∠2 = 180° Definition of supplementary angles

∠3 and ∠2 are supplementary Given

∠3 + ∠2 = 180 Definition of supplementary angles

∠1 + ∠2 = ∠3 + ∠2 Substitution

∠1 = ∠3 Substracting ∠2 from both sides