Let the length and breadth of the rectangle be x cm and y cm respectively. Perimeter of the rectangle = 10 cm ∴2(x+y)=10⇒x+y=5 Area of the rectangle =4cm2 ∴xy=4 ⇒x(5−x)=4....(1) From the given options, x = 4 satisfies equation (1). Thus, the length of rectangleis 4 cm.