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October 20, 2014

October 20, 2014

Posted by **jordan** on Monday, January 12, 2009 at 7:44pm.

- geometry -
**Damon**, Monday, January 12, 2009 at 9:04pmarea = pi r^2

169 pi = pi r^2

so

r^2 = 169

r = 13

then

we want circumference = 2 pi r

= 2 * 13 * r

= 26 r

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