Poincare Disk Model
The Poincaré disk model is a model of ndimensional hyperbolic geometry in which the points of the geometry are in an ndimensional disk, or unit ball, and the straight lines consist of all segments of circles contained within the disk that are orthogonal to the boundary of the disk, plus all diameters of the disk.
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Original problem
1146
Kaleidoscope of Geometry Problem 1146, iPad Productivity Apps; Adobe Spark Post
