Shell Method | Woody Calculus

Washer or Shell Method Explained: The Calculus 2 Decision Rule

July 14, 2026 Brian M. Woody Leave a comment

Calculus 2 washer versus shell method decision showing the same region rotated around different axes with washer formula pi integral R squared minus r squared and shell formula 2 pi integral radius times height.

Washer method or shell method? This Woody Calculus lesson teaches the Calculus 2 decision rule for volumes of revolution: identify the function form, check the axis of rotation, choose the right slice, and build the correct volume integral.

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