It's not the adjacent angles of a rhombus that are congruent, but the diagonal ones.
yes but adjacent angles are not.
two pairs of congruent angles in a rhombus
Yes, it is one of the ways to prove a figure is a rhombus. If adjacent sides are congruent, then the figure is a rhombus.
A rhombus has 4 congruent sides, but it does not necessarily have 4 congruent angles.
A rhombus always have 2 pairs of congruent angles, yes.
If all adjacent angles are congruent, it can only be a rectangle (or square).
A square, but not a rhombus because a rhombus does not have four congruent angles
A rhombus has four congruent sides. The angles don't matter, but if they're right angles, then the rhombus is a square.
A rhombus with 4 congruent angles is a rectangular rhombus having interior angles that are all right angles (90°) and therefore it is a square.