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September 3, 2014

September 3, 2014

Posted by **Celia** on Thursday, July 3, 2014 at 1:46pm.

- Calculus 1 -
**Damon**, Thursday, July 3, 2014 at 1:55pmA = 4 pi r^2

r = D/2

so

A = 4 pi D^2/4 = pi D^2

dA/dD = 2 pi D

dA/dt = 2 pi dD/dt

1 = 2 pi dD/dt

dD/dt = 1/(2pi)

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