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OpenStudy (anonymous):
find the missing dimension of a circle. the area is 81(pi)ft square
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OpenStudy (anonymous):
(using A=3.14r^2) 81 multiplied by 3.14=254.34 254.34=3.14r^2 divide both sides by 3.14 to isolate the "r" 81=r^2 then ... 9=r
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