Posted by wen on Wednesday, July 27, 2011 at 11:34am.
For absolute change rates:
dC/dt = 2*pi*dR/dt
dA/dt = 2*pi*R*dR/dt
For relative change rates
(1/C)dC/dt = (1/R) dR/dt
(1/A) dA/dt = (2/R)*dR/dt
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