Spreads, determinants and chromogeometry (I) | WildTrig: Intro to Rational Trigonometry

We give a review of some formulas for the spread between two lines, and rewrite some of them using vector language and the theory of determinants. We get the important understanding that a spread between two vectors is just a renormalization of the squared area of the parallelogram spanned by them.

We are moving towards a more general understanding that will extend to chromogeometry, which we have discussed quite a while ago in this series.

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