五角星构造

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Circle(A, B) → c
3. Circle(B, A) → d
4. Polygon(B, A, 4) → poly1, b, e, f, g, C, D
5. Midpoint(A, B) → E
6. Circle(E, C) → h
7. Line(A, B) → i
8. Intersect(h, i, 1) → F
9. Intersect(h, i, 2) → G
10. Circle(B, G) → k
11. Circle(A, F) → p
12. Intersect(k, p, 2) → H
13. Intersect(d, p, 1) → I
14. Intersect(c, k, 2) → J
15. Segment(H, I) → j
16. Segment(I, B) → l
17. Segment(A, J) → m
18. Segment(J, H) → n
19. Intersect(i, a) → K
20. Intersect(j, i) → L
21. Intersect(m, j) → M
22. Intersect(m, l) → N
23. Intersect(n, l) → O
24. Intersect(i, a) → P
25. Intersect(n, i) → Q
26. Segment(L, N) → q
27. Segment(N, Q) → r
28. Segment(Q, M) → s
29. Segment(M, O) → t
30. Segment(O, L) → a_1
31. Intersect(q, s) → R
32. Intersect(q, t) → S
33. Intersect(t, r) → T
34. Intersect(r, a_1) → U
35. Intersect(a_1, s) → V
36. Segment(V, S) → b_1
37. Segment(S, U) → c_1
38. Segment(U, R) → d_1
39. Segment(R, T) → e_1
40. Segment(T, V) → f_1
41. Intersect(b_1, d_1) → W
42. Intersect(b_1, e_1) → Z
43. Intersect(c_1, e_1) → A_1
44. Intersect(c_1, f_1) → B_1
45. Intersect(d_1, f_1) → C_1
46. Segment(W, A_1) → g_1
47. Segment(A_1, C_1) → h_1
48. Segment(C_1, Z) → i_1
49. Segment(Z, B_1) → j_1
50. Segment(B_1, W) → k_1
51. Intersect(i_1, k_1) → D_1
52. Intersect(g_1, i_1) → E_1
53. Intersect(g_1, j_1) → F_1
54. Intersect(h_1, j_1) → G_1
55. Intersect(h_1, k_1) → H_1
56. Segment(D_1, F_1) → l_1
57. Segment(F_1, H_1) → m_1
58. Segment(H_1, E_1) → n_1
59. Segment(E_1, G_1) → p_1
60. Segment(G_1, D_1) → q_1
61. Intersect(l_1, n_1) → I_1
62. Intersect(l_1, p_1) → J_1
63. Intersect(m_1, p_1) → K_1
64. Intersect(m_1, q_1) → L_1
65. Intersect(n_1, q_1) → M_1
66. Segment(I_1, K_1) → r_1
67. Segment(K_1, M_1) → s_1
68. Segment(M_1, J_1) → t_1
69. Segment(J_1, L_1) → a_2
70. Segment(L_1, I_1) → b_2
71. Intersect(t_1, b_2) → N_1
72. Intersect(r_1, t_1) → O_1
73. Intersect(r_1, a_2) → P_1
74. Intersect(s_1, a_2) → Q_1
75. Intersect(s_1, b_2) → R_1
76. Segment(N_1, P_1) → c_2
77. Segment(P_1, R_1) → d_2
78. Segment(R_1, O_1) → e_2
79. Segment(O_1, Q_1) → f_2
80. Segment(Q_1, N_1) → g_2