> See also: > - [Dot products and duality | Chapter 9, Essence of linear algebra](https://www.youtube.com/watch?v=LyGKycYT2v0) > - [Vectors | Chapter 1, Essence of Linear Algebra](https://www.youtube.com/watch?v=fNk_zzaMoSs) > - [2D Vector Calculator](https://www.xitalogy.com/apps/math/vec2dcalc/) # Scalar and Vector Quantities ## Scalars