WT46: Red geometry (I)
Red geometry is a two dimensional relativistic geometry in the spirit of rational trigonometry, using variants of the usual quadrance and spread. The usual grid plane is still the arena in which this geometry lives, but the notion of perpendicularity is new. A wonderful new world of geometry emerges from just a twist of the old definitions! This video is part of the WildTrig series, which introduces Rational Trigonometry and applies it to many different aspects of geometry.