Answer :

[tex]\textit{circumference of a circle}\\\\ C=2\pi r~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=6 \end{cases}\implies C=2\pi (6)\implies C=12\pi \implies C= \begin{cases} \stackrel{\pi =3}{36}\\\\ \stackrel{\pi =3.14}{37.68} \end{cases}[/tex]

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