Find the area of the hyperbolic (geodesic) triangle with vertices (0, 0),(0, 1) and (1, 0).

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I'm not really sure where to start for this question. I'm aware of the Gauss-Bonnet theorem $Area = \pi -(A+B+C)$ where $A,B,C$ are the interior angles of the triangle. However I am not sure how to go about calculating these angles given the vertices.