![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
Given that ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7dc8da9c725244991a3f78d942df5822.png\")
.
If the two lines in a plane are cut by a transversal so that a pair of alternate exterior angles is congruent, then the lines are parallel.
\Since ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=11d40a8f020c14cf3eb55f7b838602ce.png\")
are the alternate exterior angles and they are congruent.
Congruent alternate exterior angles indicates parallel lines. So, ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d11490419f4832baf1666486897d9c04.png\")
.