单位圆与三角函数 by Peter Sassman

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A
2. Circle(A, 1) → c
3. Intersect(c, xAxis, 2) → C
4. Intersect(c, yAxis, 2) → E
5. CircleArc(A, C, E) → d
6. Point(d) → D
7. Angle(C, A, D) → θ
8. Ray(A, D) → f
9. Segment(D, B) → g
10. Tangent(C, c) → h,
11. Intersect(h, f) → H
12. Segment(B, D) → BD
13. Point(g) → I
14. Segment(A, B) → AB
15. Point(AB) → J
16. Angle(D, B, A) → α
17. Segment(C, H) → HC
18. Point(HC) → L
19. Angle(H, C, A) → γ
20. Segment(A, H) → AH