All I did is the length of a side is x over 3. We already know what the area is. It's square root of 3 over 4 times the length of a side squared. And then the area of this square right over here, the area of the square is just going to be 100 minus x over 4 squared. So our area, our combined area, maybe I could write like this. Our combined area as a function of where we make the cut is all of this business right over here. And this is what we need to minimize.