$\begin{array}{1 1} \frac{\sqrt 5}{2}-\frac{9}{4} \sin ^{-1} \frac{2}{3} \\\frac{\sqrt 5}{2}+\frac{9}{4} \sin ^{-1} \frac{2}{3} \\ \frac{\sqrt 5}{2}+\frac{9}{4} \\\frac{\sqrt 7}{2}+\frac{9}{4} \sin ^{-1} \frac{2}{3} \end{array} $