So let's say that the variable x is the number of meters that we decide to cut from the left. So if we did that, then this length for the triangle would be x meters. And the length for the square would be, well, if we use x up for the left-hand side, we're going to have 100 minus x for the right-hand side. And so what would the dimensions of the triangle and the square be? Well, the triangle sides are going to be x over 3, x over 3, and x over 3 is an equilateral triangle. And the square is going to be 100 minus x over 4 by 100 minus x over 4. Now, it's easy to figure out an expression for the area of this square in terms of x.