Posted by Zach on Sunday, December 27, 2009 at 5:48pm.
original area = pi(1^2) = pi
new area = pi(1.85^2) = 3.4225pi
increase = 3.4225pi - pi = 2.4225pi
percentage increase = 2.4225pi/pi = 2.4225
= 242.3 %
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