Normally none, but they can have 2 or three.
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a trapezuim
4
Depending upon the trapezium, two or none: ....................................................................... ...------------.............................---------....... ...|.................\........................../..............\...... ...|.......A..........\......................./........B......\..... ...|.....................\..................../..................\.... ...----------------...................---------------... ....................................................................... Trapezium A has two; Trapezium B has none.
Of course - a trapezium is a quadrilateral.
1 down the middle