$$\frac{ 448 }{ 441 } \sqrt{ 7 } \times 64$$
$\frac{4096\sqrt{7}}{63}\approx 172.015831272$
$$64\times \frac{64}{63}\sqrt{7}$$
$$\frac{64\times 64}{63}\sqrt{7}$$
$$\frac{4096}{63}\sqrt{7}$$
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