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Author Topic: Volume of rotating graphs help  (Read 2633 times)

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Offline Yeong

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Volume of rotating graphs help
« on: August 31, 2012, 03:04:13 pm »
I don't know if I'm having a brainfart or something, but the online homework says it's wrong. Did I really do it wrong?
Here's the graph, and I rotate the region bounded by Y1 and Y2 by Y3(Y=2).



So I did this (I'm putting pi later so don't worry about that)


EDIT: Even though it says x, it's y.

so (at least in my opinion) answer should be 1.75161*pi, but the online homework is keep saying that it's wrong. D:

EDIT: problem solved. I forgot to solve graph for Y. :\
« Last Edit: August 31, 2012, 03:12:06 pm by yeongJIN_COOL »
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