平行断面による体積 定義
The formula (Volume = a∫b A(x) dx, where A(x) is the formula for the area of parallel cross-sections over the entire length of the solid.) and image 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.
The disk method and the washer method are both derived from this formula.
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“Calculus.” Volumes of Solids with Known Cross Sections, www.cliffsnotes.com/study-guides/calculus/calculus/applications-of-the-definite-integral/volumes-of-solids-with-known-cross-sections.
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