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A while ago I found the most delightful animated series on YouTube that explained the foundations of Euclidean Geometry delightfully. I decided it was so good that I needed to start off my GR9 unit, showing these videos to my learners. Below are the videos together with some other resources I have collected, related to this unit of work Euclidean Geometry.
Kahoots
Solving for Angles with Parallel Lines
Solving Basic Calculations using Euclidean Geometry Facts
Angle Relationships in Parallel Lines and Triangles