Question

1.) A parellogram must be a rhombus if the
a.) diagnals are perpendicular
b.) opposite angles are congruent
c.) diagonals are congruent
d.) opposite sides are congruent

2.) Which statement is always true about a parellogram?
a.) diagnals bisect angles
b.) diagnals are perpendicular.
c.) adjacent sides are congruent
d.) diagnols bisect each other