$\displaystyle \frac{\sqrt{5}}{2}$\displaystyle \frac{\sqrt{5}}{2}

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

$\displaystyle \frac{2\sqrt{5}}{5}$\displaystyle \frac{2\sqrt{5}}{5}

$\displaystyle \frac{3\sqrt{5}}{5}$\displaystyle \frac{3\sqrt{5}}{5}