A trapezium is defined as a quadrilateral with at least one pair of parallel sides. Using that definition, which of the following statements is FALSE?

Rectangles, squares and rhombuses are all parallelograms, so each has two pairs of parallel sides — certainly at least one pair — and all three are trapeziums under this definition. The word "exactly" is what makes the last statement false: the definition says at least one pair, so a trapezium is allowed to have two.