Your friend says, "If a quadrilateral has a pair of opposite sides that are congruent and a pair of opposite sides that are parallel, then it is a parallelogram." What is your friend's error? Explain.
Choose the correct answer below.
A quadrilateral is a parallelogram if the pair of longer sides congruent and the pair of shorter sides parallel.
A quadrilateral is a parallelogram if one pair of opposite sides are congruent and parallel.
A quadrilateral is a parallelogram if one pair of opposite sides is congruent.
A quadrilateral is a parallelogram if one pair of opposite sides is parallel.