Disc Washers

Disk integration, (also known as Disc Method in integral calculus), is a means of calculating the volume of a solid of revolution of a solid-state material, when integrating along the axis of revolution.
This method models the generated dimensional shape as a "stack" of an infinite number of disks (of varying radius) of infinitesimal thickness.
It is also possible to use "washers" instead of "disks" (the washer method) to obtain "hollow" solids of revolutions, and it uses the same principles that underlie disk integration.

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