想象：摩天轮的角度与圆几何（含分段求和/黎曼和思想）

GeoGebra 命令及参数

1. Circle(A, 5) → c
2. Point(c) → B
3. Line(A, B) → f
4. Intersect(c, f, 2) → E
5. Segment(B, E) → i
6. Line(T_1, i) → j_1
7. OrthogonalLine(A, f) → g
8. Intersect(c, g, 2) → C
9. Intersect(c, g, 1) → D
10. Segment(C, D) → h
11. Point(c) → H
12. Segment(H, A) → j
13. Point(Circle[H, 1]) → I
14. Segment(H, I) → k
15. Point(Circle[I, 0.5]) → J
16. Segment(I, J) → l
17. Point(Circle[I, 0.5]) → K
18. Segment(I, K) → m
19. Polygon(K, J, 4) → poly1, n, p, q, r, L, M
20. Polygon(M, L, 3) → poly2, s, t, a, N
21. Angle(D, A, H) → α
22. CircleSector(A, D, H) → d
23. Point(j) → S
24. Point(h) → T
25. CircleSector(A, T, S) → e
26. Mirror(A, h) → A'
27. Mirror(U, h) → U'
28. Mirror(V, h) → V'
29. Vector(W, Z) → w
30. Intersect(c, h, 2) → A_1
31. Segment(A, A_1) → b
32. Mirror(pic4, h) → pic4'
33. Line(F_1, i) → f_1
34. Segment(G_1, F_1) → g_1
35. Point(f_1) → I_1
36. Segment(H_1, I_1) → h_1
37. Point(f_1) → K_1
38. Segment(J_1, K_1) → i_1
39. Point(f_1) → L_1
40. Point(j_1) → N_1
41. Point(f_1) → O_1
42. Point(j_1) → M_1
43. Polygon(L_1, M_1, N_1, O_1) → q1, l_1, m_1, n_1, o_1
44. Mirror(L_1, h) → P_1
45. Mirror(M_1, h) → Q_1
46. Mirror(N_1, h) → R_1
47. Mirror(O_1, h) → S_1
48. Polygon(P_1, Q_1, R_1, S_1) → q1', p_1, q_1, r_1, s_1
49. OrthogonalLine(M_1, j_1) → k_1
50. OrthogonalLine(N_1, j_1) → t_1
51. Intersect(f_1, r_1) → U_1
52. Intersect(f_1, n_1) → V_1
53. Segment(U_1, V_1) → b_1
54. Point(j_1) → W_1
55. OrthogonalLine(W_1, j_1) → a_1
56. Point(j_1) → Z_1
57. Polygon(W_1, Z_1, 3) → poly3, c_1, d_1, e_1, A_2
58. Mirror(poly3, h) → poly3'