They are the sides facing each other at opposite sides.
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This just means that opposite sides in a shape (sides that 'look' at each other) are of equal lengths.
It is not clear what you mean by "has 4 right sides opposite sides equal". If you delete the phrase "4 right sides", the answer is a rhombus.
A regular square or a rhombus if you mean all four sides are equal in length, a parallelogram if you mean the opposite sides are equal.
A parallelogram is a four sided shape where opposite sides are parallel and equal lengths. If you mean that ALL sides are equal lengths, you are looking for a rhombus.
If you mean on opposite sides yes. There are 2 pairs of congruent angles.