Perimeter of a rectangle and a square are equal. If length and breadth of the rectangle are 20 cm and 16 cm, find the difference between area of the rectangle and the square.

• A. \[2c{{m}^{2}}\]
• B. \[4c{{m}^{2}}\]
• C. \[~6c{{m}^{2}}\]
• D. \[8c{{m}^{2}}\]
• E. None of these