If the area of a rectangle is equal to the area of a square and length of the rectangle is equal to the perimeter of the square, then the breadth of rectangle is ________

• A.  side \[\div \] 2
• B.  \[{{\text{(side)}}^{\text{2}}}\div 2\]
• C. \[\text{side}\div \text{4}\]
• D.  \[\text{side}\div 3\]