单位圆与正弦余弦

GeoGebra 命令及参数

1. Point(xAxis) → B
2. Intersect(xAxis, yAxis) → C
3. Rotate(B, α, C) → B'
4. Segment(B, C) → g
5. FractionText(2 / ar) → p
6. CircleArc(C, B, B') → d
7. Textfield(α) → InputBox1
8. OrthogonalLine(B', xAxis) → f
9. Intersect(xAxis, f) → A
10. Polygon(A, C, B') → poly1, Cosine, a, Sine
11. Point(yAxis) → D
12. Point(xAxis) → E
13. Point(yAxis) → F
14. CircleArc(C, B, D) → e
15. CircleArc(C, D, E) → h
16. CircleArc(C, E, F) → k
17. CircleArc(C, F, B) → q
18. Ray(C, B') → i
19. Intersect(e, i) → P,
20. Intersect(h, i) → H,
21. Intersect(k, i) → I,
22. Intersect(q, i) → J,
23. Angle(J, C, B) → β
24. Angle(A, C, I) → γ
25. Angle(H, C, A) → δ
26. Angle(A, C, P) → ε
27. Rotate(B, α, C) → B'_1
28. Angle(B, C, B'_1) → ζ
29. Midpoint(Sine) → G
30. Midpoint(C, A) → K