If the radius of a circle decreases by 10%. find the % change in the area of the circle./
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Original Radius = 10
Original Area = pi(R^2) = 100pi
New Radius = 9
New Area = pi(R^2) = 81pi
Percentage Change = (New - Old)/Old = (81pi - 100pi)/100pi = -19pi/100pi = -19% = 19% decrease
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