# Volume of a Solid of Revolution (1)

### Problem

### How to use the applet.

- Rotation
- "Animate" button shows the revolution of the original
figure about the x-axis.
- A Cross-Section
- It shows the solid of revolution and a cross-section.

To move the cross-section, click "+" and "-" button.
- Disks
- It visualizes the idea of disk method.
The volume of the solid is approximated by computing the
sum of the volume of disks. To change the number of disks,
click "+" and "-" button.

### Applet

### Solution