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Answer :
(i) Given a \(\parallel \)
So, \(\angle \)1 = \(\angle \)5 (Pair of corresponding angles)
(ii) Given: \(\angle \)4 = \(\angle \)6
So, a \(\parallel \) b [If pair of alternate angles are equal, then the lines are parallel]
(iii) Given: \(\angle \)4 + \(\angle \)5 = 180°
So, a \(\parallel \) b [If sum of interior angles is 180°, then the lines are parallel]