$\displaystyle 2-\frac{3\sqrt{3}}{2}$\displaystyle 2-\frac{3\sqrt{3}}{2}

$\displaystyle 2+\frac{\sqrt{3}}{2}$\displaystyle 2+\frac{\sqrt{3}}{2}

$\displaystyle 4- \frac{\sqrt{3}}{2}$\displaystyle 4- \frac{\sqrt{3}}{2}

$\displaystyle 4+ \frac{3\sqrt{3}}{2}$\displaystyle 4+ \frac{3\sqrt{3}}{2}