What is the volume of the solid produced by revolving #f(x)=sqrt(81-x^2)# around the x-axis?
The given curve is located at the first and second quadrants as shown in the graph
You will notice that the graph shows that it is a half circle with radius
Formula for volume of the sphere
To solve for the volume by the Calculus , we make use of the Disk Method
God bless....I hope the explanation is useful.