平行四边形面积计算 by Lee W Fisher

GeoGebra 命令及参数

1. Polygon(A, B, C, D) → q1, a, b, c, d
2. Point(Circle[I, sqrt(45)]) → J
3. Segment(I, J) → i
4. Midpoint(I, J) → K
5. Circle(K, J) → k
6. Rotate(J, atan(2), I) → J'
7. Angle(J, I, J') → α
8. Ray(I, J') → j
9. Intersect(k, j, 2) → L
10. Polygon(I, L, J) → t1, j_1, i_1, l
11. Point(Circle[M, 6]) → N
12. Segment(M, N) → n
13. Circle(M, 7) → p
14. OrthogonalLine(M, n) → q
15. OrthogonalLine(N, n) → r
16. Intersect(p, q, 2) → O
17. OrthogonalLine(O, q) → s
18. Intersect(r, s) → P
19. Rotate(P, atan(0.5), O) → P'
20. Angle(P, O, P') → β
21. Ray(O, P') → t
22. Intersect(r, t) → Q
23. Polygon(M, N, Q, O) → q3, m_1, n_1, q_1, o
24. Angle(Q, N, M) → γ
25. Point(Circle[E, 6]) → F
26. Segment(E, F) → f
27. OrthogonalLine(E, f) → g
28. OrthogonalLine(F, f) → h
29. Point(h) → G
30. Point(Circle[G, 10]) → H
31. Segment(G, H) → f_1
32. Point(g) → R
33. Point(Circle[R, 10]) → S
34. Segment(R, S) → g_1
35. Polygon(G, R, S, H) → q2, g_2, r_1, s_1, h_1
36. Angle(r_1, f) → δ
37. Point(Circle[H_1, sqrt(116)]) → I_1
38. Segment(H_1, I_1) → l_1
39. Midpoint(H_1, I_1) → J_1
40. Circle(J_1, I_1) → p_1
41. Rotate(H_1, atan(2.5), I_1) → T
42. Angle(H_1, I_1, T) → ε
43. Ray(I_1, T) → t_1
44. Intersect(p_1, t_1, 2) → U
45. Polygon(H_1, I_1, U) → t2, u_1, h_2, i_2
46. Point(Circle[V, 4]) → P_1
47. Segment(V, P_1) → m_2
48. Circle(P_1, sqrt(29)) → d_2
49. Circle(V, sqrt(29)) → e_2
50. Intersect(d_2, e_2, 1) → Q_1
51. Line(Q_1, m_2) → n_2
52. Segment(V, Q_1) → p_2
53. Line(P_1, p_2) → q_2
54. Intersect(n_2, q_2) → R_1
55. Polygon(V, P_1, R_1, Q_1) → q5, v, p_3, r_2, q_3
56. Point(Circle[S_1, 5]) → T_1
57. Segment(S_1, T_1) → s_2
58. OrthogonalLine(S_1, s_2) → t_2
59. OrthogonalLine(T_1, s_2) → a_2
60. Circle(S_1, 4) → c_3
61. Intersect(c_3, t_2, 1) → U_1
62. Circle(T_1, 2) → d_3
63. Intersect(d_3, a_2, 1) → V_1
64. Polygon(U_1, V_1, T_1, S_1) → q6, u_2, v_1, t_3, s_3
65. Point(Circle[W, sqrt(29)]) → Z
66. Segment(W, Z) → k_1
67. Midpoint(W, Z) → A_1
68. Circle(A_1, Z) → c_1
69. Rotate(W, atan(2.5), Z) → W'
70. Angle(W, Z, W') → ζ
71. Ray(Z, W') → b_1
72. Intersect(c_1, b_1, 2) → B_1
73. Polygon(Z, B_1, W) → t3, w_1, z_1, b_2