Hi All, I had a question about this problem I was doing and was hoping to see if I did it right. 1. The problem statement, all variables and given/known data Using Disk or Washer method Find volume of the solid generated by revolving the region bounded by y=sqrt(x), y=2, x=0 about the line y=2. 2. Relevant equations Disk Method: pi*Integral (R(x))^2dx where R(x) is the distance from the axis of revolution to the regions boundaries. 3. The attempt at a solution Limits of integration are [0,4] I was getting caught up with what R(x) is. Since I am revolving up around y=2 I am wondering if the distance is 2-sqrt(x) or sqrt(x)-2 Doing the problem with R(x)=sqrt(x)-2 I get: 8pi/3 Doing the problem with R(x) = 2-sqrt(x) I get: 8pi/3 again... So what I am wondering is, in the future, which one is the correct R(x)? or does it not matter? I feel like it should be 2-sqrt(x) because that more clearly sticks out to me as the radius but im not sure.