C3 volume of revolution Watch

The_Blade
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11d

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BabyMaths
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x^2=\frac{144}{y^2}
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The_Blade
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(Original post by BabyMaths)
x^2=\frac{144}{y^2}
How do I do it

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The_Blade
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(Original post by BabyMaths)
x^2=\frac{144}{y^2}
Sorry my bad all u can see from my phone is a smiley face but then went on to Web view. I can see my mistake. I put 2 instead of 12 lol

Thanks!

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brianeverit
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Your integration i8s totally wrong. Volume of revolution about the y axis is given by
\pi \displaystyle\int_{y_1}^{y_2}x^2 dy=\pi\displaystyle\int_1^3 \frac{144}{y^2}dy
Can you finish it from here?
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