方位角动态演示 by Tim Brzezinski (2)

GeoGebra 命令及参数

1. Circle(A, 3) → c
2. Intersect(c, f) → B, C
3. Ray(A, B) → g
4. Ray(A, C) → h
5. Circle(A, r) → d
6. Intersect(d, g) → D,
7. Intersect(d, h) → F,
8. Intersect(d, i) → G, H
9. Rotate(D, ((-a) * π / 180), A) → D'
10. Rotate(D, (a * π / 180), A) → D'_1
11. Rotate(F, (a * π / 180), A) → F'
12. Rotate(F, ((-a) * π / 180), A) → F'_1
13. Dilate(A, If[0 < b ≤ 1, 1 - b, 0], F) → A'
14. Dilate(A, If[0 < b ≤ 1, 1 - b, 0], D) → A'_1
15. Segment(A, A'_1) → j
16. Segment(A, A') → k
17. Angle(D', A, D) → α
18. Rotate(D, If[1 < b ≤ 2, ((-(b - 1)) * α), (-α)], A) → E
19. Rotate(D, If[1 < b ≤ 2, ((b - 1) * α), (-α)], A) → I
20. Rotate(F, If[1 < b ≤ 2, ((b - 1) * α), (-α)], A) → F'_2
21. Rotate(F, If[1 < b ≤ 2, ((-(b - 1)) * α), (-α)], A) → F'_3
22. Angle(E, A, D) → β
23. Angle(D, A, I) → γ
24. Angle(F'_3, A, F) → δ
25. Angle(F, A, F'_2) → ε
26. Segment(A, E) → p
27. Segment(A, I) → q
28. Segment(A, F'_2) → s
29. Segment(A, F'_3) → t
30. Textfield(r) → InputBox1