$$2 \frac{ 3 }{ 7 } 2 \sqrt{ 2 }$$
$\frac{34\sqrt{2}}{7}\approx 6.869037303$
$$2\times \frac{14+3}{7}\sqrt{2}$$
$$2\times \frac{17}{7}\sqrt{2}$$
$$\frac{2\times 17}{7}\sqrt{2}$$
$$\frac{34}{7}\sqrt{2}$$
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