So let's say we have an equilateral triangle just like that. And its sides are length s, s, and s. Now, we know that the area of a triangle is 1 half times the base times the height. So in this case, the height we could consider to be an altitude. If we were to drop an altitude just like this, this length right over here, this is the height. And this would be perpendicular just like that. So our area is going to be equal to 1 half times our base is s, 1 half times s times whatever our height is. Now, how can we express h as a function of s?