### Home > CALC > Chapter 12 > Lesson 12.1.5 > Problem 12-60

12-60.

Graph the functions.

The lowest point is at *y* = 4.

The height is *y*. The radius is *x*.

The volume will be *πx*^{2}*dy*.

Express the main function in terms of *x*, which is the radius.

Let *h* = 4 and solve for *dh*/*dt*.