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Washer Method

Washer Method

A technique for finding the volume of a solid of revolution. The washer method is a generalized version of the disk method. Both the washer and disk methods are specific cases of volume by parallel cross-sections.

Graph showing washer method: Volume = integral from a to b of π([f(x)]²−[g(x)]²)dx, with y=f(x) outer curve, y=g(x) inner curve.

 

 

See also

Shell method, axis of rotation