Area is the space covered by an object. It is the realm occupied by all forms. When measuring the area of a square, we only consider the length of the sides. Since all sides of a square are equal, its area is equal to the square of the sides.
So the area of square = (side × side ) square units.
It is given that side of the square is 3 cm .
Putting side = 3 cm in the area formula we will get the desired area .