球面三角形角度演示

GeoGebra 命令及参数

1. Sphere((0, 0, 0), 1) → a
2. PointIn(a) → A
3. PointIn(a) → B
4. PointIn(a) → C
5. Intersect(yAxis, zAxis) → D
6. CircleSector(D, A, C) → c
7. CircleSector(D, B, A) → d
8. CircleSector(D, C, B) → e
9. Angle(B, D, A) → α
10. Angle(A, D, C) → β
11. Angle(C, D, B) → γ
12. Line(D, A) → b
13. Line(D, C) → f
14. Line(D, B) → g
15. OrthogonalPlane(A, b) → h
16. Circle(A, 0.25, b) → k
17. OrthogonalPlane(B, g) → i
18. Circle(B, 0.25, g) → p
19. OrthogonalPlane(C, f) → j
20. Circle(C, 0.25, f) → q
21. Plane(D, A, C) → l
22. Plane(D, A, B) → m
23. Plane(D, B, C) → n
24. PointIn(n) → E
25. IntersectPath(h, m) → r
26. IntersectPath(h, l) → s
27. IntersectPath(j, l) → t
28. IntersectPath(n, j) → a_1
29. IntersectPath(i, m) → b_1
30. IntersectPath(i, n) → c_1
31. Intersect(s, t) → F
32. Intersect(a_1, c_1) → G
33. Intersect(b_1, r) → H
34. Line(A, F) → d_1
35. Line(F, C) → e_1
36. Line(C, G) → f_1
37. Line(G, B) → g_1
38. Line(B, H) → h_1
39. Line(H, A) → i_1
40. Angle(H, A, F) → δ
41. Angle(F, C, G) → ε
42. Angle(G, B, H) → ζ