Square
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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
:D I think that it is a rhombus cause a rhombus has four congruent sides but may not be a square or a rectangle.
All quadrilaterals have 4 sides hence the root word quad. If you have 4 equal sides with 4 equal angles you have your basic square.
If all 4 sides are equal and the angles are not 90 degrees it is a rhombus.