Trapezium.
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Trapezoid
a rectangle is a shape that has two sets of parallel lines a trapezoid only has to have one set of parallel lines
A triangle, as it only has three lines and the only two that are possible touch at the top.
A square or rectangle has two sets of parallel lines. Stop signs technically have 4 short sets o parallel lines. Hexagon could have 3 sets, etc. All of which are polygons, though not all polygons have parallel lines.
A shape that has all parallel sides, like a square, rectangle, or a rhombus. A trapazoid wouldn't be one because only one set of lines are parallel.