\textbf{126-} An equilateral triangle has a side length of 4 units, which is the diameter of a square. What is the shortest distance from the other vertices of the rectangle to the side of this triangle?
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\hfill $2-\sqrt{3}\ (1$ \hfill $\sqrt{3}-1\ (2$ \hfill $\dfrac{1}{2}\sqrt{3}\ (3$ \hfill $1\ (4$
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