$$\frac{ 4 \sqrt{ 4 \sqrt{ 9 } } }{ 7 }$$
$\frac{8\sqrt{3}}{7}\approx 1.979486637$
$$\frac{4\sqrt{4\times 3}}{7}$$
$$\frac{4\sqrt{12}}{7}$$
$$\frac{4\times 2\sqrt{3}}{7}$$
$$\frac{8\sqrt{3}}{7}$$
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