Its 4 interior angles add up to 360 degrees
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No, a trapezoid is not a parallelogram. Irregular polygons are generally not parallel.
4 right angles, no other angles.
there are no angles
If it has only one pair of parallel sides and not two, then it's not a parallelogram. It's a trapezium (trapezoid).
It has 6 angles, none of which are right angles.