i'm confused...Find the volume fo the solid obtained by rotating the region bounded by $y = \frac{x^2}{4}$, $x=2$, and $y = 0$ about the y-axis...

do i use circular disk or washer? because it only has one function (so cant be washer)...and when i revolved it..it has a hole (so cant be disk) o.O

Question

i'm confused...Find the volume fo the solid obtained by rotating the region bounded by $y = \frac{x^2}{4}$, $x=2$, and $y = 0$ about the y-axis...

do i use circular disk or washer? because it only has one function (so cant be washer)...and when i revolved it..it has a hole (so cant be disk) o.O

anonymous · Answer

you can use either... 
and actually, you can get away with the disk/washer without knowing the other...  but it might produce a harder integral.

lgbasallote · Answer

uhmm can you tell me how to washer this? i know one function is x^2/4 what's the other? o.O

anonymous · Answer

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