geometry
posted by jordan .
how do you find the circumference of a circle with the area of 169 pie m squared(in the terms of pie)? Please tell me how to do it. Don't just give me the answer

area = 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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