1. Trigonometry

4. Units degrees radians 360⁰ is full rotation
historical reasons for using sexagesimal (base 60) system
better than base 10 for exact division
radians
angle created by a circular arch whose length is equal to the circle’s radius
2π is full rotation
1 radian ≈ 57.3⁰

6. Unit Circle

7. Trig Ratios

8. https://ggbm.at/cNEtsbvC

9. Domains and Ranges

10. Mnemonic
SOH CAH TOA
Some Old Hippie Caught Another Hippie Tripping On Acid

11. Inverse Trig Ratios

13. The Sine Rule

14. The Cosine Rule

15. Compound-Angle Identities

16. Double-Angle Identities if β = α

17. Perimeter Relationships