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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §15.2 Line Integrals, #19 · Multivariable Calculus · Vector calculus

A wire hoop around a vertical circle … has density

A wire hoop around a vertical circle $x^{2} + z^{2} = a^{2}$ has density $ρ = a + z$ . Find its mass $M = \int ρ d s$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §15.2 Line Integrals, #19

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