Usually none but it's quite possible for it to have two.
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There are 3 different types: ordinary, isosceles and right which has 2 right angles
No.
720 degrees * * * * * The internal angles of any quadrilateral add to 360 degrees.
4 right angles, no other angles.
Letter L unless you count the ends as additional sides An irregular quadrilateral, such as certain trapezium. should that be trapezia or trapeziums?