Which quadrilateral has exactly one pair of parallel sides?

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The quadrilateral that has exactly one pair of parallel sides is called a trapezoid.

To determine this, let's first understand what a trapezoid is. A trapezoid is a quadrilateral with at least one pair of parallel sides. In other words, it can have more than one pair of parallel sides but must have at least one.

Now, in order to determine which quadrilateral has exactly one pair of parallel sides, we can eliminate other quadrilaterals that do not meet this condition. Let's consider each type of quadrilateral:

1. Rectangle: A rectangle has opposite sides that are parallel and equal in length. Therefore, it doesn't have exactly one pair of parallel sides.

2. Square: A square is a special type of rectangle where all sides are equal in length and all angles are right angles. Like a rectangle, it doesn't have exactly one pair of parallel sides since all sides are parallel.

3. Rhombus: A rhombus is a quadrilateral with all sides equal in length. Its opposite sides are parallel, so it doesn't have exactly one pair of parallel sides either.

4. Parallelogram: A parallelogram has two pairs of parallel sides, so it also doesn't have exactly one pair of parallel sides.

Finally, we come to the trapezoid. A trapezoid can have one pair of parallel sides and the other two sides are non-parallel. This makes it the quadrilateral that has exactly one pair of parallel sides.

So, in conclusion, a trapezoid is the quadrilateral that has exactly one pair of parallel sides.