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 has one pair of parallel sides. The defining characteristic of a trapezoid is that it has at least one pair of sides that are parallel, while the other pair can be of different lengths and are not parallel.
A trapezoid has one pair of parallel sides.
A trapezoid may have zero or one pair of congruent sides.
2 pairs
Zero
2
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.
A trapezoid has one pair of parallel sides. The defining characteristic of a trapezoid is that it has at least one pair of sides that are parallel, while the other pair can be of different lengths and are not parallel.
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.