旋转对称性演示

GeoGebra 命令及参数

1. Corner(pic1, 1) → LB
2. Midpoint(LB, RT) → MM
3. Polygon(A, B, 3) → poly1, a, a_1, b, C
4. Midpoint(a) → D
5. Midpoint(a_1) → E
6. Segment(A, E) → c
7. Segment(D, C) → d
8. Intersect(c, d) → F
9. Rotate(A, α, F) → A'
10. Rotate(B, α, F) → B'
11. Rotate(C, α, F) → C'
12. Polygon(A', B', C') → poly1', c', a', b'
13. Polygon(G, H, I, J) → poly2, g, h, i, j
14. Segment(G, I) → e
15. Segment(J, H) → f
16. Intersect(e, f) → K
17. Rotate(G, α, K) → G'
18. Rotate(H, α, K) → H'
19. Rotate(I, α, K) → I'
20. Rotate(J, α, K) → J'
21. Polygon(G', H', I', J') → poly2', g', h', i', j'
22. Rotate(pic1, α, L) → pic1'
23. Polygon(M, N, 5) → poly3, m_1, n, p, q, r, O, P, Q
24. Midpoint(p) → R
25. Midpoint(n) → S
26. Segment(Q, S) → s
27. Segment(M, R) → t
28. Intersect(t, s) → T
29. Rotate(M, α, T) → M'
30. Rotate(N, α, T) → N'
31. Rotate(O, α, T) → O'
32. Rotate(P, α, T) → P'
33. Rotate(Q, α, T) → Q'
34. Polygon(M', N', O', P', Q') → poly3', m', n', o', p', q'
35. Angle(B, A, C) → β
36. Angle(B', A', C') → γ
37. Angle(H, G, J) → δ
38. Angle(H', G', J') → ε
39. Segment(G', I') → b_1
40. Segment(J', H') → c_1
41. Intersect(c_1, b_1) → U
42. Angle(N', M', Q') → ζ
43. Angle(N, M, Q) → η
44. Segment(T, M') → d_1
45. Point(d_1) → V
46. Segment(V, N') → e_1
47. Segment(V, O') → f_1
48. Segment(V, P') → g_1
49. Segment(V, Q') → h_1
50. Corner(pic1, 2) → RB