Find volume of solid generated by revolving the region bounded by the graphs of the equations about the indicated lines.

y = sqrt(x), y = 0, x = 4

ABOUT Y-AXIS.

If picture is sideways, please rotate for easy reading.

I got the right answer when rotating about the x-axis (same question). For rotation about the x-axis, my limits were [0,4] and my answer is 8pi.

Am I using the wrong limits for rotation about the y-axis or is my integral set up all wrong? If so, can someone set up the correct integral and explain how you did it. I will do the calculation on my own to find the volume.