Find the surface area of the solid of revolution obtained by rotating the curve from y= 2 to y= 5 about the x-axis.

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- March 3rd 2009, 03:10 PMMy Little PonySurface Area of Solid of Revolution
Find the surface area of the solid of revolution obtained by rotating the curve from y= 2 to y= 5 about the x-axis.

- March 3rd 2009, 03:11 PMMy Little Pony
I keep getting 580.3030543, but apparently that is not the right answer.

- March 3rd 2009, 03:19 PMJameson
Since you have attempted the problem in its entirety, it's a good idea to post your work. That way it's easier for those who can help to spot your error and to see what you know/don't know.

- March 3rd 2009, 03:47 PMMy Little Pony
I used the formula:

2*pi*y*sqrt(1+(dx/dy)^2)dy

From that, I got: - March 3rd 2009, 03:48 PMMy Little Pony
I know I plugged in the numbers correctly, because I checked it carefully about four times.

- March 4th 2009, 08:04 PMMy Little Pony
Bump. Anyone? I can't tell if I'm integrating properly.