Technically, lines are continuous, so parallelograms are actually composed of line segments. The line segments composing the sides of the parallelogram, come in two pairs in 2D space. Each pair is composed of two line segments that are parallel to each other, but do not occupy the same line. The two pares of line segments must all meet to then form a quadrilateral.
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parallelograms have two sets of parallel lines trapezoids do not
Some do, but not all. It's not a general thing that you can say about all parallelograms.
No. Rectangles are parallelograms with all right angles, while parallelograms just have 2 sets of parallel lines.
They all have parallel lines.
Yes they do.