Which lines can you conclude are parallel given that m∠7 + m∠11 = 180? Justify your conclusion with a theorem.
Line a is parallel to line b by the Converse of the Alternate Interior Angles Theorem.
Line a is parallel to line b by the Converse of the Same-Side Interior Angles Theorem.
Line c is parallel to line d by the Converse of the Alternate Interior Angles Theorem.
Line c is parallel to line d by the Converse of the Same-Side Interior Angles Theorem.7 + m∠
