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Poincar´e Disk_2
Given points [b] [color=#0a971e]A,B ∈ c[/color][/b], construct the hyperbolic geodesic [math]retta_{AB}[/math]: equivalently construct the unique circle through[color=#0a971e] [b]A,B[/b][/color] that is orthogonal to[b] c[/b]