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A rhombus is a quadrilateral with four congruent sides. The opposite angles are congruent but not necessarily 90 degrees.
The definition of a rectangle is a quadrilateral with four 90 degree angles, which is not always a square. The definition of a square is a quadrilateral with four 90 degree angles and all sides congruent, which is always a rectangle.
rectangle
A square.
A regular quadrilateral. A plane shape with four sides which are equal in length and which meet at right angles.