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MBA, Ph.D in Management
Harvard university
Feb-1997 - Aug-2003
Professor
Strayer University
Jan-2007 - Present
The radius of a circle increases from an initial value of r = 8 inches
 by an amount Δr = dr = 0.2 inch.
 Estimate the corresponding increase in the circle's area by evaluating dA. The area of a circle is given by A(r) = πr2.
 (Round your answer to two decimal places.)
We estimate that the area of the circle increases by about Â
 ___________square inches.
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