Solution
$$\pi\ r^2=9\pi\ $$
$$r^2=9$$
r = 3
Circumference = $$2\pi\ r$$= $$2\pi\ \times\ 3=6\pi\ $$
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$$\pi\ r^2=9\pi\ $$
$$r^2=9$$
r = 3
Circumference = $$2\pi\ r$$= $$2\pi\ \times\ 3=6\pi\ $$
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