三角函数基本单位圆

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A
2. Point(xAxis) → B
3. Circle(A, B) → c
4. Rotate(G, α, H) → G'
5. Angle(G, H, G') → Θ
6. Line(H, G') → f
7. OrthogonalLine(G, xAxis) → g
8. Intersect(f, g) → D
9. OrthogonalLine(G', xAxis) → h
10. Intersect(h, xAxis) → E
11. Segment(E, G') → i
12. Segment(H, D) → j
13. Segment(H, G') → k
14. Segment(H, E) → l
15. Segment(D, G) → m
16. OrthogonalLine(G', yAxis) → n
17. Intersect(n, yAxis) → F
18. Segment(F, G') → p