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I can differentiate functions but i'm kinda confused on what to do when it is like y=4

So say you have the given: y= x^2 and then y=4, x=0, x=2. Rotate about the y-axis.

I'm know you have to get it into respect to y so x=sqrt(y) but what would I do from there?! you can't put x in terms of y for y=4! i'm confused. Can somebody help me out or point me in the right direction.