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If line M is parallel line N then <1 is congruent to <2.If <1 is congruent to <2 then line M is parallel to line N due to the converse of alternate Exterior Angles.If two parallel lines are cut by a transversal,then the two pairs of alternate exterior angles are congruent.
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If line L is parallel line M then <1 is congruent to <2.If <1 is congruent to <2 then line L is parallel to line N due to the corresponding angels postulate.If two parallel lines are cut by a transversal,then the pairs of corresponding angles are congruent.
