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UTM Videos

Triangles whose three angles are all zero!

Mark Norfleet

If the sum of the three angles of a triangle where smaller than 180 degrees, what should we do? What hope can we have? Do not fear--hyperbolic geometry is here to save the day! We will discuss four different models of the hyperbolic plane (where these types of triangles live), illustrate the connection between the models, and conclude with how to "see" some actions on the hyperbolic plane.