Chromogeometry allows us to consider not just the usual nine-point circle of a triangle, but also a red and a green nine-point circle, which are in fact rectangular hyperbolas. This video uses The Geometer's Sketchpad to illustrate the various special points to be found on these nin-point circles, and how they interact. This video is part of the WildTrig series, which introduces Rational Trigonometry and applies it to many different aspects of geometry.
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