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Radius of a circle problem test 1?
If the radius of a circle is decreased by 30 percent, by what percent will the area of the circular region be decreased?
How to set up the problem?
1 Answer
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- ?Lv 68 years ago
If the radius decreased by 30%, the new radius is 70% of the old one, so area will
decrease by .7^2=.49 or 49% since A=pir^2
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