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January 30, 2015

January 30, 2015

Posted by **nate** on Tuesday, November 29, 2011 at 5:30pm.

- calculus -
**Reiny**, Tuesday, November 29, 2011 at 5:55pmSA = 4πr^2

d(SA)/dt = 8πr dr/dt

when r = 4.5

3 = 8π(4.5) dr/dt

dr/dt = 3/(36π) cm/min

d(diameter)/dt = 2(3/(36π)) cm/min

= 1/(6π) cm/min or appr. 0.0531 cm/min

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