Usually none.
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A trapezium can have either no right angles or exactly 2 right angles: ...................................... ......------.........---------...... ..../........\.......|..........\..... .../..........\......|...........\.... ../............\.....|............\... ..-------------.....------------... ....................................... Are two trapezia: the first has no right angles, the second has 2.
A trapezium can have right angles as long as there is at least one pair of parallel lines.
Depending upon the trapezium, two or none: ....................................................................... ...------------.............................---------....... ...|.................\........................../..............\...... ...|.......A..........\......................./........B......\..... ...|.....................\..................../..................\.... ...----------------...................---------------... ....................................................................... Trapezium A has two; Trapezium B has none.
A Trapezium have 2 equal angles.
None or 2, depending upon the trapezium.