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Hyperbolic triangle
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==Definition== A hyperbolic triangle consists of three non-[[collinear]] points and the three segments between them.<ref>{{citation|first=Wilson|last=Stothers|title=Hyperbolic geometry|url=http://www.maths.gla.ac.uk/~wws/cabripages/hyperbolic/hyperbolic0.html|publisher=[[University of Glasgow]]|year=2000}}, interactive instructional website</ref> <!-- ref>[[Svetlana Katok]] (1992) ''Fuchsian Groups'', [[University of Chicago Press]] {{ISBN|0-226-42583-5}}</ref> What namely says the book on the definition? -->
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