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. But let's think about what the area of an equilateral triangle might be as a function of the length of its sides. So let me do a little bit of an aside right over here. So let's say we have an equilateral triangle just like that.