The perimeter of the rectangle is  m.

Perimeter of a rectangle is ,

where is the length of the rectangle.

          is the breadth of the rectangle.

Find in terms of .

Find the area of the rectangle in terms of .

Area of the rectangle is

Substitute in the area of the rectangle.

Domain :

The area of the function is .

All possible values of is the domain of the function.

Area of the rectangle should be a greater than zero.

and .

Therefore the domain of the function is .

Area of the rectangle in terms of length is .

The domain of is .