19. Complete the paragraph proof Given: ∠1 and ∠2 are supplementary.and ∠ 2 and ∠3 are supplementary
Prove: ∠1≅∠3

By definition of supplementary angles, m∠1+ m∠2 =____
(b). Then, m∠1 + m∠2 = m∠2 + m∠3 by the______
(c). Subtract m∠2 from each side. You get m∠1=_______(d), or ∠1 ≅
(e).

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