volume of sphere

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April 13th 2009, 11:31 AM
metlx

volume of sphere

how to get to the volume of sphere with radius r using the integrals..

that's what i tried..

$\int \Pi r^2 dr = \frac{\Pi r^3}{3}$

I'm missing 4 :P
April 13th 2009, 11:54 AM
Jhevon

Quote:

Originally Posted by metlx

how to get to the volume of sphere with radius r using the integrals..

that's what i tried..

$\int \Pi r^2 dr = \frac{\Pi r^3}{3}$

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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