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A Trapezium have 2 equal angles.
A trapezium has 4 angles. The 2 adjacent angles are supplementary and the 4 angles together add up to 360 degrees.
In general, no.
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A trapezium does not have to have adjacent sides equal, but might have. In the US, trapezium just means any old four-sided shape. Outside the US, it means a shape with at least two parallel sides.