how to get to the volume of sphere with radius r using the integrals.. that's what i tried.. $\displaystyle \int \Pi r^2 dr = \frac{\Pi r^3}{3} $ I'm missing 4 :P
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Originally Posted by metlx how to get to the volume of sphere with radius r using the integrals.. that's what i tried.. $\displaystyle \int \Pi r^2 dr = \frac{\Pi r^3}{3} $ I'm missing 4 :P use volumes of revolutions. rotate a semi circle of radius r in the upper half-plane, centered at the origin about the x-axis. use the disk method
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