There is no such thing as a parallelogram with only one set of parallel sides.
No. Both opposite sides are parallel. They are also congruent
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a trapezod
Every quadrilateral that is a standard square, rectangle, or parallelogram has at least ONE pair of parallel sides - and they all have two pairs of parallel sides. For only ONE pair of parallel sides, you need an irregular trapezoid.
No. The congruent sides need not be parallel.
A trapezium (as it is known in English) is a quadrilateral which is a closed plane figure with four straight sides. It has one pair of parallel sides. The other pair of sides is not parallel (otherwise the figure would become a parallelogram).
A quadrilateral having only one pair of parallel sides is called a trapezoid (UK trapezium).A quadrilateral having two pair of parallel sides is a parallelogram (a square, a rectangle, a rhombus, or a two-dimensional rhomboid).