正弦与余弦的单位圆读取示例

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A
2. Point(xAxis) → B
3. Circle(A, B) → c
4. Point(c) → P
5. Ray(A, P) → f
6. Angle(xAxis, f) → α_1
7. Line(P, yAxis) → g
8. Intersect(g, xAxis) → P'
9. Segment(P, P') → h
10. Line(P, xAxis) → i
11. Intersect(i, yAxis) → P''
12. Segment(P'', P) → j
13. Distance(P'', A) → distancesinαA
14. Distance(A, P') → distanceACosα
15. Segment(A, P') → k
16. Segment(P'', A) → l
17. Intersect(c, xAxis, 1) → C
18. Segment(A, C) → m
19. Angle(m, f) → α