So I can construct this triangle. And so let's think about the area of what I am shading in right over here. How can I express that area? Well, it's a triangle. We know that the area of a triangle is 1 1 2 base times height. We know the height is the absolute value of the sine of theta, and we know that the base is equal to one. So the area here is going to be equal to 1 1 2 times our base, which is one, times our height, which is the absolute value of the sine of theta.