Which quadrilateral has exactly one pair of parallel sides?

• A. Trapezoid
• B. Parallelogram
• C. Rectangle
• D. Kite

Answer: (A)

Exactly one pair of parallel sides identifies a trapezoid. In a trapezoid, only one pair of opposite sides runs parallel, while the other pair is not. A parallelogram has two pairs of parallel sides, so it isn’t the one. A rectangle is a special parallelogram with right angles, so it also has two parallel pairs. A kite generally has no parallel sides, since its defining feature is two distinct pairs of adjacent equal sides. Therefore, the shape with exactly one pair of parallel sides is the trapezoid.