# Math Help - Surface Area of Solid of Revolution

1. ## Surface 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.

2. I keep getting 580.3030543, but apparently that is not the right answer.

3. 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.

4. I used the formula:

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

From that, I got:

5. I know I plugged in the numbers correctly, because I checked it carefully about four times.

6. Bump. Anyone? I can't tell if I'm integrating properly.