The dimensions 4ft x 9ft represent the length and width of an object or space. The dimension 4ft refers to the length, while 9ft refers to the width.
no
I apologize for misunderstanding your previous statement. It appears that you are providing the dimensions of an object or space rather than requesting an explanation. In this case, 4ft x 9ft means that the object or space is 4 feet in length and 9 feet in width.
