三角比：运用情境介绍三角比

GeoGebra 命令及参数

1. Point(Sequence[((0.5 * cos(i°)), (0.5 * sin(i°))), i, 0, 90]) → R
2. Ray((2 * R), (3 * R)) → ray
3. Point(Sequence[R + (i * UnitVector[Segment[R, (2 * R)]]), i, 0.1, 4, 0.1]) → P
4. Segment(O, P) → rod
5. Segment(P, Q) → string
6. Angle((1, 0), O, P) → α
7. Angle(P, Q, O) → β
8. Segment(O, P') → rod'
9. Segment(P', Q') → string'
10. Angle(P', Q', O) → γ
11. Angle(Q', O, P') → δ