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.

Given 1 and 2 are supplementary angles Prove l m STATEMENT REASON 11 and 2 are supplementary angles 1 Given 2 m1 m2 180 2 3 1 and 3 are supplementary angles 3 E class=