探索3：改变角度

GeoGebra 命令及参数

1. Rotate(D, 120°, A) → D'
2. Angle(D, A, D') → α
3. Rotate(E, 120°, B) → E'
4. Angle(E, B, E') → β
5. Rotate(F, 120°, C) → F'
6. Angle(F, C, F') → γ
7. CircleSector(A, D, D') → c
8. CircleSector(B, E, E') → d
9. Point(c) → G
10. Point(d) → H
11. Segment(G, A) → f
12. Segment(H, B) → g
13. Ray(C, F) → h
14. Ray(C, F') → i
15. Point(h) → I
16. Point(i) → J
17. Point(h) → G_1
18. Point(h) → H_1
19. Point(h) → I_1
20. Point(h) → J_1
21. Point(i) → A_2
22. Point(i) → F_2
23. Polygon(J, K, V, Z, A_1, B_1, C_1, D_1, E_1, F_1, G_1, F, L, H_1, I_1, J_1, C, L_1, M_1, N_1, O_1, P_1, Q_1, M, R_1, S_1, T_1, U_1, V_1, W_1, Z_1, A_2, B_2, C_2, N, D_2, F', E_2, F_2, O, P, Q, R, T) → poly1, j, t, v, z_1, a_1, b_1, c_1, d_1, e_1, f_1, g_1, k, f_2, h_1, i_1, j_1, c_2, l_1, m_1, n_1, o_1, p_1, l, q_1, r_1, s_1, t_1, u_1, v_1, w_1, s, a_2, b_2, m, a, d_2, f', e_2, b, n, o, p, q, r
24. Point(poly1) → S
25. Segment(S, C) → e
26. Circle(U, 2) → k_1
27. Point(k_1) → W
28. Rotate(W, 120°, U) → W'
29. Angle(W, U, W') → δ
30. CircleSector(U, W, W') → g_2
31. Segment(W', U) → h_2
32. Segment(U, W) → i_2
33. Point(i) → K_1
34. Segment(C, K_1) → j_2
35. Segment(E', B) → k_2
36. Segment(D, A) → l_2