Co-interior (allied / consecutive interior) angles on the same side of a transversal cutting parallel lines…

Co-interior (allied / consecutive interior) angles on the same side of a transversal cutting parallel lines are
  1. supplementary ($180^{\circ}$)
  2. equal
  3. complementary ($90^{\circ}$)
  4. vertically opposite

Solution

Sum of co-interior angles $= 180^{\circ}$.

Asked in: MH-SSC-9

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