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

8-57.

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 *y* = 1 to *y* = 13. Both the bounds and the integrand will be written in terms of *y*.

Unlike problem 8-55, there will be a cylindrical hole in the center of this 3D figure. This hole has a radius of 1.

Unlike problem 8-55, the outer function is no longer *f*(*y*). It is 1 unit longer than *f*(*y*).