**Volume by Parallel Cross Sections**

The formula below gives the volume of a solid. *A*(*x*) is the formula for the area of parallel cross-sections over the entire length of the solid.

Note: The disk method and the washer method are both derived from this formula.

**Movie clips (with narration) **

Volume by Parallel Cross-Sections: The Concept This can be a slow download. File size is 15.2M. | Volume by Parallel Cross-Sections: Example Squares on an Ellipse This can be a slow download. File size is 16.4M. |

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