A trapezoid has only 1 pair of parallel sides of different lengths
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All quadrilaterals except parallelogramshave less than 2 pairs of parallel sides.
A rhombus has two opposing acute angles (less than 90º) and two opposing obtuse (greater than 90º) angles, with the opposing sides being parallel and the sides being of equal length. A parallelogram can have the two acute angles and two obtuse angles, but have sides of different lengths. That is: two opposing sides shorter than the other two opposing sides. All angles total 360º
More or less the same as a square. 4 right angles (90 degrees) 2 pairs of parallel lines.If you can guarantee that the opposite sides of your 4-sided figure are parallel,OR that they're equal, AND that the figure has one right angle inside it, thenyou can be sure that it's a rectangle.
A hexagon or any of a selection of polyhedrons with 10 or more sides. I am not sure that less than 10 sides will suffice but they may well do.
The (equal) sides of an isosceles triangle (drawn with the base on the bottom) cannot be parallel. They must intersect at the top with an included angle greater than zero and less than 180 degrees.