if I have a hyperbolic quadrilateral ABCD such that $\angle A=\angle B=\frac{2\pi}{3}$, $AD=BC$ and we know the hyperbolic lengths of sides $AB$ and $CD$, how can I calculate the hyperbolic length of $AD$?

put on hold as off-topic by Neil Hoffman, Alexandre Eremenko, Chris Godsil, Yemon Choi, Gabriel C. Drummond-Cole Dec 9 at 5:40

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  • 2
    I think this question would be more appropriate to Math Stack Exchange. – Lubin Dec 7 at 16:00
  • What does hyperbolic quadrilatral mean – greedoid Dec 7 at 17:01
  • i wrote it in math stack exchange now – user164226 Dec 7 at 18:36