It could be an irregular polygon with 5 or more sides or a rectangle or square.
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A figure with four congruent angles is a rectangle. In a rectangle, all four angles are right angles and therefore congruent to each other.
no triangle do not have four congruent angles
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.
A parallelogram with no right angles and four congruent sides is a Rhombus.
A rhombus has 4 congruent sides, but it does not necessarily have 4 congruent angles.