$$\frac{ 9 }{ 6 } \pi \frac{ 9 }{ 5 }$$
$\frac{27\pi }{10}\approx 8.482300165$
$$\frac{3}{2}\pi \times \frac{9}{5}$$
$$\frac{3\times 9}{2\times 5}\pi $$
$$\frac{27}{10}\pi $$
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