which of the following may not be true for a parallelogram to be a rhombus
a. the diagonals are perpendicular
b. the diagonals are congruent
c. all sides are congruent
d. each diagonal bisects each pair of opposite angles
a. the diagonals are perpendicular
b. the diagonals are congruent
c. all sides are congruent
d. each diagonal bisects each pair of opposite angles