A Geometric Algebra Solution to a Hard Contest Problem

Timestamps are provided below for your convenience. We use GA's rotations and outer products of vectors to find the missing length that will enable us to then solve the problem via the Law of Cosines.

Timestamps:
00:00 Introduction
01:00 A pdf of the solution is available online
01:07 Outline of the video
01:41 Ideas that we will use in the solution
03:03 Solution Strategy
03:35 GA formulation of the problem
04:35 Solution
07:45 *** Verification of the solution via an interactive GeoGebra construction ***
09:20 Please consider joining the LinkedIn group "Pre-University Geometric Algebra"

Link to the pdf of the solution:
https://vixra.org/abs/2404.0116

LinkedIn group, "Pre-University Geometric Algebra":
https://www.linkedin.com/groups/8278281/

GeoGebra website
https://www.geogebra.org/