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Circle Trig
(Lecture: 10 minutes)
- Trig functions are coordinates on unit circle.
- Angles measure (scaled) arclength.
Reflections
Having just given students a chance to reflect on the essential ideas of circle trigonometry (in this SWBQ), this is an opportunity to reinforce the geometry of trig with a clear, unifying lecture. The order is important: this is circle trig, not (yet) triangle trig; the trig functions are defined as coordinates on the unit circle, not as ratios.