In a trapezium, the sum of the two angles on the same non-parallel side (same leg) is:

In a trapezium, the sum of the two angles on the same non-parallel side (same leg) is:
  1. $90^{\circ}$
  2. $180^{\circ}$
  3. $270^{\circ}$
  4. $360^{\circ}$

Solution

The two angles on the same leg of a trapezium are co-interior angles between the parallel bases, so they are supplementary, summing to $180^{\circ}$.

Asked in: IMO

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