A rectangular plot of land has dimensions $x$ meters by $y$ meters. The plot of land is 216 square meters in area. Farmer Ted encloses the rectangle with a fence and then divides the rectangle into two equal parts with another fence of length $x$ meters parallel to one of the sides. In terms of $x$ and $y,$ what is the total length of fence used? Describe the length of the fence used in terms of only one variable.