The more common definition of a trapezoid (or trapezium, outside of North America) is a four-sided figure with exactly one pair of parallel sides. By this definition, figures with two sets of parallel sides such as a rectangle are nottrapezoids.
Some mathematicians use a more general definition that allows for one or more pair of parallel sides. By this definition, a rectangle, square, or rhombus would be considered as special cases of a trapezoid.
A trapezoid has one pair of parallel sides.
A trapezoid may have zero or one pair of congruent sides.
Zero
One pair.
A trapezoid is a quadrilateral with one pair of sides parallel.
A trapezoid has one pair of parallel sides.
A trapezoid may have zero or one pair of congruent sides.
2 pairs
2
Zero
One pair.
1
It doesn't need any in order to be a trapezoid. It can have a max of two pairs of perpendicular sides.
One pair
One pair.
2It has one pair more because a parallelogram has two pairs of parallel sides whereas a trapezoid only has one pair of opposite parallel sides of different lengths.
A trapezoid has only 1 pair of opposite parallel sides of different lengths