There is no specific name - other than what you used: "a pair of parallel line segments".
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A geometric figure that has three line segments for sides is a triangle. Rectangles and squares are made of four line segments, while a circle is made out of a pair of arcs.
If you mean one pair of parallel lines, then you're talking about a trapezoid.
draw a square then tilt one line from each pair of parallel sides away from its pair then adjust the lengths of the top and bottom sides to make it match
A pair of parallel lines at a distance of 1 cm from the line Q.
A quadrilateral with at least one pair of parallel sides has multiple possible names, depending on what type of quadrilateral it is.SquareRectangleParallelogramRhomboidTrapezoidYou are probably looking for only one pair of parallel sides, which is a trapezoid - both regular and irregular.