A trapezium can have right angles as long as there is at least one pair of parallel lines.
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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.
No
no it has three
Usually none.
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.