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posted by Jessica Thursday, March 7, 2013 at 11:40am.
If the radius of a circular wave is increasing at 2 meters/sec, how fast is the area changing when the radius is 5 meters?
a = pi r^2 da/dt = 2pi r dr/dt da/dt = 2pi * 5 * 2 = 20pi m^2/s
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