$$\frac{1}{2}\times\frac{\sqrt{3}}{2}+\frac{\sqrt{3}}{2}\times\frac{1}{2}$$
$\frac{\sqrt{3}}{2}\approx 0.866025404$
$$\frac{\sqrt{3}}{2\times 2}+\frac{\sqrt{3}}{2}\times \frac{1}{2}$$
$$\frac{\sqrt{3}}{2\times 2}+\frac{\sqrt{3}}{2\times 2}$$
$$2\times \frac{\sqrt{3}}{2\times 2}$$
$$2\times \frac{\sqrt{3}}{4}$$
$$\frac{\sqrt{3}}{2}$$
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