# Disc integration

**Disc integration**, also known in integral calculus as the **disc method**, is a method for calculating the volume of a solid of revolution of a solid-state material when integrating along an axis "parallel" to the axis of revolution. This method models the resulting three-dimensional shape as a stack of an infinite number of discs of varying radius and infinitesimal thickness. It is also possible to use the same principles with rings instead of discs (the "**washer method**") to obtain hollow solids of revolutions. This is in contrast to shell integration, which integrates along an axis *perpendicular* to the axis of revolution.

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