trapezoid
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A square is a four-sided polygon with two congruent parallel sides.
a rectangle, which has two sets of parallel side
The four sided shape that has two parallel lines is called a trapezoid. A parallelogram is a four sided shape that has two pairs of parallel lines.
A rectangle is a shape that has four sides with two parallel lines.
If two sides are parallel and the other two aren't, the shape is a trapezoid.