Co-interior angles are $100^{\circ}$ and $80^{\circ}$. The lines are

Co-interior angles are $100^{\circ}$ and $80^{\circ}$. The lines are
  1. parallel
  2. not parallel
  3. perpendicular
  4. identical

Solution

Sum $= 180^{\circ}$, supplementary $\Rightarrow$ parallel.

Asked in: MH-SSC-9

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