47
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.