R is the region in the first and second quadrants bounded above by the graph y=(20)/(1 + x^2) and below by the line y= 2. find the volume of the solid when generated by the x axis.
Okay, so I set the hyperbola function as the outer radius and the horizontal line as the inner radius. Then I squared it and multipied by pi and integrated, but I'm getting a really big unreasonable number.
The truth is I don't know for sure how you set it up; you didn't explain too well.
Yes, you are correct about setting the hyperbolic function as the outer radii and the y = 2 as the inner radii.
But in the integrand, did you subtract them then square them?
Or did you square each one individually then subtract them?
Write it out..