Paper 3, Section I, F

Geometry and Groups | Part II, 2014

Let H2\mathbb{H}^{2} denote the hyperbolic plane, and TH2T \subset \mathbb{H}^{2} be a non-degenerate triangle, i.e. the bounded region enclosed by three finite-length geodesic arcs. Prove that the three angle bisectors of TT meet at a point.

Must the three vertices of TT lie on a hyperbolic circle? Justify your answer.

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