Which information is not sufficient to prove that a parallelogram is

a square?

(1) The diagonals are both congruent and perpendicular.

(2) The diagonals are congruent and one pair of adjacent sides are

congruent.

(3) The diagonals are perpendicular and one pair of adjacent sides

are congruent.

4) The diagonals are perpendicular and one pair of adjacent sides

are perpendicular.

BE