$$=\frac{\sqrt{3}}{4}\times36\sqrt{3}\times36\sqrt{3}$$
$972\sqrt{3}\approx 1683.553384957$
$$36\times 36\times \frac{\sqrt{3}}{4}\times 3$$
$$1296\times \frac{\sqrt{3}}{4}\times 3$$
$$3888\times \frac{\sqrt{3}}{4}$$
$$972\sqrt{3}$$
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