Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §8.5 Masses and Moments, #24 · Calculus · Applications of integrals

Pappus (an ancient Greek) noticed that the volume is …V=\int 2\pi y(\text{strip…

Pappus (an ancient Greek) noticed that the volume is
$V = \int 2 π y (strip width) d y = 2 π M x = 2 π \overset{y}{ˉ} M$
when a region of area $M$ is revolved around the $x$ axis. In the first step the solid was cut into ______.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §8.5 Masses and Moments, #24

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