A square cannot be 5 cm by 3 cm! The question, therefore, concerns a shape that cannot exist.
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16cm.
20cm/4sides = 5cm 5cm*5cm = 25cm^2
Perimeter of rectangle: 5+3+5+3 = 16cm
Multiply the length of any side by itself ("square" it). To find the are of any rectangle, including a square you multiply the length by the width, e.g. if it is a 5cm square the area is 5x5=25cm2. If it's a rectangle with a 3cm x 5cm the area is 3x5 = 15cm2.
5*3 = 15 square cm