1. It is a quadrilateral that has 4 sides
2. It has 1 pair of parallel sides
3. Its 4 interior angles add up to 360 degrees
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No, a trapezoid could not have three right angles. If it did, it would be a rectangle, as the fourth angle would need to be 90 degrees as well. A rectangle is not a trapezoid.
trapezoid
Parallelogram quadrilateral trapezoid rectangle square
You cannot have a trapezoid with three sides! Or if the question was something like 'You know three of the four sides of a trapezoid' ; that cannot be done either, because there is no way of calculating what the length of the fourth side is.