三角形面积计算 by Ooi Soo Huat

GeoGebra 命令及参数

1. Line(A, xAxis) → a
2. Line(A, yAxis) → b
3. Point(a) → B
4. Line(B, b) → c
5. Point(c) → C
6. Line(C, a) → d
7. Point(d) → G
8. Intersect(b, d) → D
9. If(NearC ≟ true, C, If[NearD ≟ true, D, G]) → Pm
10. DynamicCoordinates(G, x(Pm), y(Pm)) → E
11. Polygon(A, E, B) → poly1, b_1, a_1, e
12. OrthogonalLine(E, d) → f
13. Intersect(a, f) → F
14. Polygon(E, D, A) → poly2, a_2, e_1, d_1
15. Polygon(E, C, B) → poly3, b_2, e_2, c_1
16. Polygon(B, F, E) → poly4, e_3, b_3, f_1
17. Polygon(A, E, F) → poly5, f_2, a_3, e_4
18. Midpoint(F, A) → H
19. Midpoint(F, B) → I
20. Midpoint(A, D) → J
21. Midpoint(B, C) → K
22. Midpoint(A, B) → L
23. Midpoint(D, C) → M
24. Circle(D, ja) → g
25. Circle(A, ja) → h
26. Circle(J, ja) → k
27. Line(J, K) → i
28. Intersect(g, d, 1) → N
29. Circle(K, ja) → p
30. Intersect(k, b, 2) → O
31. Intersect(p, c, 2) → P
32. Intersect(k, b, 1) → Q
33. Intersect(p, c, 1) → R
34. Line(O, P) → j
35. Line(Q, R) → l
36. Circle(O, ja) → q
37. Circle(Q, ja) → s
38. Intersect(q, j, 1) → S
39. Intersect(s, l, 1) → T
40. Vector(S, N) → u
41. Intersect(h, a, 1) → U
42. Vector(T, U) → v
43. Circle(C, ja) → r
44. Intersect(g, b, 2) → V
45. Intersect(r, c, 2) → W
46. Circle(M, ja) → t
47. Intersect(t, d) → Z, A_1
48. Circle(L, ja) → g_1
49. Intersect(g_1, a) → B_1, C_1
50. Line(C_1, A_1) → m
51. Line(B_1, Z) → n
52. Circle(A_1, ja) → h_1
53. Circle(Z, ja) → k_1
54. Intersect(h_1, m, 2) → D_1
55. Intersect(k_1, n, 2) → E_1
56. Vector(D_1, W) → w
57. Vector(E_1, V) → u_1
58. If(x(E) < x(D), "c", "d") → Td
59. Circle(H, ja) → p_1
60. Intersect(p_1, a) → F_1, G_1
61. Line(G_1, f) → i_1
62. Line(F_1, i_1) → j_1
63. Circle(G_1, ja) → q_1
64. Circle(F_1, ja) → r_1
65. Intersect(q_1, i_1, 1) → H_1
66. Intersect(r_1, j_1, 1) → I_1
67. Circle(F, ja) → s_1
68. Intersect(s_1, a) → J_1, K_1
69. Intersect(h, b, 1) → L_1
70. Circle(B, ja) → d_2
71. Intersect(d_2, c, 1) → O_1
72. Intersect(s_1, f, 1) → M_1
73. Circle(I, ja) → t_1
74. Intersect(t_1, a) → N_1, P_1
75. Line(P_1, c) → l_1
76. Line(N_1, c) → m_1
77. Circle(N_1, ja) → c_2
78. Circle(P_1, ja) → g_2
79. Intersect(c_2, m_1, 1) → Q_1
80. Intersect(g_2, l_1, 1) → R_1
81. If(x(E) < x(C), Vector[Q_1, M_1], Vector[R_1, M_1]) → n_1
82. If(x(E) < x(C), Vector[R_1, O_1], Vector[Q_1, O_1]) → u_2
83. If(x(E) > x(D), Vector[H_1, M_1], Vector[I_1, M_1]) → w_1
84. If(x(E) > x(D), Vector[I_1, L_1], Vector[H_1, L_1]) → v_1
85. Circle(P, ja) → h_2
86. Circle(R, ja) → k_2
87. Intersect(h_2, j, 2) → S_1
88. Intersect(k_2, l, 2) → T_1
89. Intersect(r, d, 2) → U_1
90. Intersect(d_2, a, 2) → V_1
91. Vector(S_1, U_1) → v_2
92. Vector(T_1, V_1) → w_2
93. Angle(A, D, E) → α
94. Angle(E, B, A) → β
95. Angle(E, F, B) → γ
96. Angle(E, C, B) → δ
97. Angle(B, A, E) → ε
98. Angle(C, B, A) → ζ
99. Angle(A, F, E) → η
100. Angle(A, D, C) → θ
101. FractionText(0.5) → text7
102. SelectedIndex(Bahasa) → nn
103. If(nn ≟ 1, LaTeX["\text{Area of red region = }"], LaTeX["\text{Luas rantau merah = }"]) → Tex1