Because it is a regular 4 sided quadrilateral having 4 equal sides and 4 equal interior angles each measuring 90 degrees.
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A rhombus, or its special case, the square.
A square.
A rhombus is a quadrilateral by definition. A quadrilateral is a polygon with 4 sides. A rhombus is a quadrilateral where all 4 sides have equal lengths. All rhombuses are also parallelograms. If a rhombus has right angles, the it is also a square. Meaning that a square is a special type of rhombus. A rhombus is a special type of parallelogram. A parallelogram is a special type of quadrilateral.
A rhombus is a quadrilateral by definition. A quadrilateral is a polygon with 4 sides. A rhombus is a quadrilateral where all 4 sides have equal lengths. All rhombuses are also parallelograms. If a rhombus has right angles, the it is also a square. Meaning that a square is a special type of rhombus. A rhombus is a special type of parallelogram. A parallelogram is a special type of quadrilateral.
Rectangle or quadrilateral with four equal sides and angles.