You maybe thinking of a square or a rhombus because a rectangle does not have four congruent sides.
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It is a rectangle. If all four sides are congruent, then the rectangle is also a square.
In all parallelograms, opposite angles and opposite sides are congruent. If all four sides are congruent, it's a rhombus. If all four angles are congruent, it's a rectangle. If all four sides and all four angles are congruent, it's a square.
It is a rectangle unless all sides are congruent, in which event it is a square.
It could be an irregular polygon with 5 or more sides or a rectangle or square.
All figures with four congruent sides are rhombuses. All figures with four congruent angles are rectangles. Any shape that is both a rhombus and a rectangle is a square.