3/4 of a rotation or 270 degrees
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It would be impossible. A trapezoid can't have three right angles. It would just make a rectangle.
a tetrahedron has 3 Right angles
No, if a trapezium had three right angles, it would mean the fourth angle would have to be 90 degrees. That would make it a square or a rectangle.
A pentagon with 3 right angles is considered to be an irregular pentagon because not all angles and all sides are equal.