Let the side length of a small square be x, then x+6 is the length of the rectangle and x+2 is the width of the rectangle.

The square area is 36 square centimeters smaller than the original rectangular area, which can be obtained.

(x+6)(x+2)=x*x+36

The result of the solution is x=3.

The area of a rectangle is (3+6)*(3+2)=45.

How many times have you written wrong?