A square always has, and any polygon with more than four sides can have.
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A rhombus (4 congruent sides, diagonals perpendicular)that is not also a square (no right angles), andis also a parallelogram (opposite sides parallel and congruent, opposite angles congruent). It is also a quadrilateral, which has 4 sides.
rectangle
A square, because congruent means equal.
Yes .But it depends what shape
A parallelogram cannot have only two congruent sides, nor only two congruent angles.