### Home > CALC > Chapter 8 > Lesson 8.1.6 > Problem 8-57

8-57.

Suppose the shape in problem 8-55 was revolved around the line instead of the

*-axis. Set up and evaluate a new integral that would calculate the volume of the solid.*

Like problem 8-55, the rotating radius will be horizontal (because the axis of rotation is vertical). Consequently, the bounds of integration will be *y*-values: from to

*. Both the bounds and the integrand will be written in terms of*

*.*

Unlike problem 8-55, there will be a cylindrical hole in the center of this 3D figure. This hole has a radius of

Unlike problem 8-55, the outer function is no longer . It is

*.*