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Q.1 State the property that is used in each of the following statements? (i) If a $$\parallel$$ b, then $$\angle$$1 = $$\angle$$5 (ii) If $$\angle$$4 = $$\angle$$6, then a $$\parallel$$ b (iii) If $$\angle$$4 + $$\angle$$5 = 180°, then a $$\parallel$$ b

(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]