1.

figures, a transversal n cuts two lines I and m. Is line I II m2wingthe85°12070°60°

Answer»

i) These two lines are not parallel because the corresponding opposite angles are not equal, which is a necessary condition for two lines to be parallel.ii) These two lines are parallel because these two angles are complementary, which is a necessary condition for two lines to be parallel.

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No-1 not parallel (alternative exterior angle is not same) No-2 parallel (sum of co-exterior angle is 180 degree



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