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Mathematics
OpenStudy (anonymous):

In a word processing document or on a separate piece of paper, use the guide to construct a two column proof proving that lines l and m are parallel. Angles 1 and 2 are supplementary by definition. Submit the entire proof to your instructor. Given: ∠1 and ∠2 are supplementary angles Prove: l || m STATEMENT REASON 1.∠1 and ∠2 are supplementary angles 1. Given 2. m∠1 + m∠2 = 180° 2. 3. ∠1 and ∠3 are supplementary angles 3. Exterior sides in opposite rays 4. 4. 5. m∠1 + m∠2 = m∠1 + m∠3 5. 6. 6. 7. l || m 7.

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