The previous post was about triangles on a sphere. This post will be about triangles on a pseudosphere. A pseudosphere looks something like the bell of a trumpet or a trombone. Here’s a plot of a pseudosphere. This was created in Mathematica with the code ParametricPlot3D[ { Cos[p] Sech[t], -Sech[t] Sin[p], t - Tanh[t] }, […] The post Triangles on a pseudosphere first appeared on John D. Cook....