A wire 16 meter long has to be molded in a rectangular shape. What dimensions about the rectangle has to be used to manimize the cost?
As I said in your previous post of this, your last sentence makes no sense to me.
Since no cost is mentioned, all I can say is that the cost would depend on the perimeter, the greater the perimeter --> the greater the cost.
Of course such a rectangle must be a square.
Each side is 4 m