No, it has four pairs.
If the sides are labelled a, b, c and d, the four adjacent pairs are ab, bc, cd and da. The fourth can be derived from the other three.
However, two pairs is not enough for a rhombus. A kite, for example, has two pairs of congruent adjacent sides: ab and cd.
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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.
always-
It is a rhombus. If the sides form right angels, it can also be classified as a square. It is a rhombus. If the sides form right angels, it can also be classified as a square. It's a rhombus.
Diamond
It must be a rhombus