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January 30, 2015

January 30, 2015

Posted by **Jessica** on Thursday, March 7, 2013 at 11:40am.

- math -
**Steve**, Thursday, March 7, 2013 at 12:04pma = pi r^2

da/dt = 2pi r dr/dt

da/dt = 2pi * 5 * 2 = 20pi m^2/s

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