Maximum Area = 100 m^2
In dealing with maxima and minima, we have to be familiar of the commonly used properties. In this case, if asked about the maximum area of rectangle given with the perimeter, the shape to be considered should be a square. A square is also a king of rectangle.
Perimeter = 40 m
Measure of each side of the square = 40/4
= 10m
Area of the square (maximum area of a rectangle) = 10*10
= 100 m^2
