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.
Full Playlist Link
A fun review of Terminology
Euclidean Geometry Basics
Terminology about Lines
Solving for Angles with Parallel Lines
Solving Basic Calculations using Euclidean Geometry Facts
Angle Relationships in Parallel Lines and Triangles
A while ago I started compiling a collection of fun resources related to the basics of Trigonometry. They will be most useful when acting as a supplementary resource to classroom instruction.
Intro to Trig
Understanding the Unit Circle Definition of Trig