A rectangle is a quadrilateral which has two pairs of parallel sides, meeting (in pairs) at right angles. The same applies to a square. A rhombus is a quadrilateral which has two pairs of parallel sides and all four sides are of equal length. The same applies to a square.
A square is a rhombus - it has all the properties of a rhombus. A square also has the additional property that all angles are right angles. This means that all squares are rhombuses, but not all rhombuses are squares. squares are quadrilaterals.
square has a property of having all of its four angles to be right angles. however, rhombus do not have right angles... both squares and rhombus have equal sides. hope so, this may help you... Regards, Ch.Omer