Answer
[tex]lets \: \: \: find \: \: \: the \: \: radius\\ 2\pi \: r = 85.132 \\ \frac{2\pi \: r}{2\pi} = \frac{85.132}{2\pi} \\ r = 13.55cm[/tex]
[tex]lets \: \: \: find \: \: \: the \: \: area \\ \pi {r}^{2} \\ \pi \times (13.55 )^{2} \\ = 576.80 {cm}^{2} [/tex]
[tex]lets \: \: \: find \: \: \: the \: \: \: diameter \\ d = 2r \\ d = 2 \times 13.55 \\ d = 27.1cm[/tex]
