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January 26, 2015

January 26, 2015

Posted by **Ali** on Friday, November 30, 2012 at 6:33pm.

y=x^2

y=0

x=3

about the y-axis

- Calculus [Finding volume of solid] -
**Reiny**, Friday, November 30, 2012 at 6:47pmmake a sketch

this one is easier than the others you posted

volume about the y-axis

= π∫x^2 dy

= π∫y dy from y = 0 to 9

= π [ (1/2)y^2 ] from 0 to 9

= π (81/2 - 0)

= 81π/2

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