The area of a surface of revolution
A band's area is its circumference times its slant width, so $S = 2\pi\int y\,ds$ — the arc length element, not $dx$.
About 25 minutes7 activities Paper packet
A band's area is its circumference times its slant width, so $S = 2\pi\int y\,ds$ — the arc length element, not $dx$.
About 25 minutes7 activities Paper packet