Final answer:
A trapezoid cannot have three congruent sides.
Step-by-step explanation:
A trapezoid is a quadrilateral with one pair of parallel sides.
If three sides of a trapezoid are congruent, it means that those three sides are equal in length.
Since a trapezoid has only one pair of parallel sides, it is not possible for all three sides to be congruent. Therefore, the statement is true.
Learn more about Properties of trapezoids