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

We continue exploring spreads from a linear algebra point of view, introducing a dot product, or inner product between vectors, along with our cross product of planar vectors (a number in this case!) We review how the quadrance of a vector is defined in terms of the dot product, as well as the spread.

We explain the relation between the dot product and perpendicularity. And then we introduce the beautiful trilogy of dot products: blue, red and green!

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