6. In the given figures below, decide whether is parallel to .
(i) In this case. the sum of the interior angle is thus l is not parallel to m.\
(ii) In this case also l is not parallel to m as the corresponding angle cannot be (Linear pair will not form).
(iii) In this l and m are parallel. This is because the corresponding angle is and it forms linear pair with .
(iv) The lines are not parallel as the linear pair not form. (Since corresponding angle will be otherwise.)