日本定理：循环多边形的内切圆

GeoGebra 命令及参数

1. Vector(P, Q) → u
2. Circle(O, 1) → c
3. Point(c) → A
4. Point(c) → B
5. Point(c) → C
6. Point(c) → D
7. Point(c) → E
8. Polygon(A, B, C, D, E) → poly1, a, b, c_1, d, e
9. Translate(A, u) → A'
10. Translate(B, u) → B'
11. Translate(C, u) → C'
12. Translate(D, u) → D'
13. Translate(E, u) → E'
14. Polygon(A', B', C', D', E') → poly1', a', b', c', d', e'
15. Translate(A', u) → A''
16. Translate(B', u) → B''
17. Translate(C', u) → C''
18. Translate(D', u) → D''
19. Translate(E', u) → E''
20. Polygon(A'', B'', C'', D'', E'') → poly1'', a'', b'', c'', d'', e''
21. Translate(A'', u) → A'''
22. Translate(B'', u) → B'''
23. Translate(C'', u) → C'''
24. Translate(D'', u) → D'''
25. Translate(E'', u) → E'''
26. Polygon(A''', B''', C''', D''', E''') → poly1''', a''', b''', c''', d''', e'''
27. Translate(A''', u) → F
28. Translate(B''', u) → G
29. Translate(C''', u) → H
30. Translate(D''', u) → I
31. Translate(E''', u) → J
32. Polygon(F, G, H, I, J) → poly2, f, g, h, i, j
33. Segment(A, D) → k
34. Segment(A, C) → l
35. Segment(B', E') → m
36. Segment(B', D') → n
37. Segment(C'', A'') → p
38. Segment(C'', E'') → q
39. Segment(D''', B''') → r
40. Segment(D''', A''') → s
41. Segment(J, H) → t
42. Segment(J, G) → a_1
43. Incenter(A, B, C) → d_1, b_1, K, L
44. Incenter(A, C, D) → e_1, f_1, M, N
45. Incenter(A, D, E) → g_1, h_1, R, S
46. Incenter(A', E', B') → k_1, i_1, T, U
47. Incenter(E', D', B') → p_1, j_1, V, W
48. Incenter(B', D', C') → q_1, l_1, Z, A_1
49. Incenter(C'', A'', B'') → r_1, m_1, B_1, C_1
50. Incenter(C'', E'', A'') → s_1, n_1, D_1, E_1
51. Incenter(C'', D'', E'') → t_1, a_2, F_1, G_1
52. Incenter(D''', E''', A''') → c_2, b_2, H_1, I_1
53. Incenter(D''', A''', B''') → d_2, e_2, J_1, K_1
54. Incenter(D''', B''', C''') → f_2, g_2, L_1, M_1
55. Incenter(J, G, F) → h_2, i_2, N_1, O_1
56. Incenter(J, H, G) → k_2, j_2, P_1, Q_1
57. Incenter(J, I, H) → p_2, l_2, R_1, S_1