Madhu's flower ga

Let the initial length of side be x

So, the area of a square = a² = x² m²

New length = 3 + x

New width = 1 + x

Now it is a rectangle

Area of rectangle = l × b = (3 + x) × (1 + x)

So according to given conditions

19 + x² = 3 + 4 x + x²

4 x = 16

x = 4m

Therefore, length of side is 4m.