我的总和面积公式不是计算的

So in the project I'm doing I have a circle centered at the origin and I need to cut a vertical line through it. I'm trying to calculate the area of the smaller ratio of the circle; my inputs are the radius and the left and right hand ratio. for now I'm just trying to make sure it's doing my calculations correctly, and it is calculating the ratio properly, but its not calculating the ratio area at all. please helpSo in the project I'm doing I have a circle cen