If a transversal cuts two parallel lines and one co-interior angle is $80^{\circ}$, the other is

If a transversal cuts two parallel lines and one co-interior angle is $80^{\circ}$, the other is
  1. $100^{\circ}$
  2. $80^{\circ}$
  3. $10^{\circ}$
  4. $180^{\circ}$

Solution

Sum of co-interior $= 180^{\circ}$, so other $= 100^{\circ}$.

Asked in: MH-SSC-9

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