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动态变换与旋转

动态变换与旋转
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2017-01-26 03:14
三角函数几何作图
该范例展示了三角函数中的动态变换与旋转现象。涉及的核心数学概念包括三角函数、变换和旋转。通过使用Mirror、Dilate、Rotate等GeoGebra命令，可以观察到图形的动态变化。适合高中数学教学，特别是解析几何和三角函数的教学。

GeoGebra 命令及参数

  1. Mirror(G, f) → G'
  2. Mirror(F, f) → F'
  3. Mirror(E, g) → E'
  4. Mirror(F, g) → F'_1
  5. Mirror(G, g) → G'_1
  6. Mirror(F', g) → F''
  7. Mirror(G', g) → G''
  8. Mirror(E, f) → E'_1
  9. Mirror(E'_1, g) → H
  10. Intersect(g, j) → I
  11. Intersect(g, i) → J
  12. Intersect(g, h) → K
  13. Dilate(L, If[0 < a ≤ 1, 1 - a, 0], K) → L'
  14. Segment(L, L') → k
  15. Dilate(K, If[1 < a ≤ 2, 2 - a, 0], E) → K'
  16. Segment(K, K') → l
  17. Polygon(L, K, E) → poly1, e, l_1, k_1
  18. Midpoint(L, E) → M
  19. Dilate(E, If[2 < a ≤ 3, 3 - a, 0], M) → E'_2
  20. Segment(E, E'_2) → m
  21. Dilate(M, If[3 < a ≤ 4, 4 - a, 0], L) → M'
  22. Segment(M, M') → n
  23. Rotate(K, If[4 < a < 5, ((-(a - 4)) * π / 3), ((-π)) / 3], E) → K'_1
  24. Rotate(K', If[4 < a < 5, ((-(a - 4)) * π / 3), ((-π)) / 3], E) → K''
  25. Segment(K'_1, K'') → l'
  26. Rotate(K'_1, If[5 < a < 6, ((-(a - 5)) * π), (-π)], M) → N
  27. Rotate(K'', If[5 < a < 6, ((-(a - 5)) * π), (-π)], M) → K'''
  28. Segment(N, K''') → l''
  29. Rotate(L, If[6 < a < 7, ((a - 6) * π / 2), π / 2], L) → L'_1
  30. Rotate(K, If[6 < a < 7, ((a - 6) * π / 2), π / 2], L) → K'_2
  31. Rotate(E, If[6 < a < 7, ((a - 6) * π / 2), π / 2], L) → E'_3
  32. Polygon(L'_1, K'_2, E'_3) → poly1', e'_3, l'_1, k'_2
  33. Rotate(K, If[6 < a < 7, ((a - 6) * π / 2), π / 2], L) → K'_3
  34. Rotate(K', If[6 < a < 7, ((a - 6) * π / 2), π / 2], L) → K''_1
  35. Segment(K'_3, K''_1) → l'_2
  36. Rotate(L, If[6 < a < 7, ((a - 6) * π / 2), π / 2], L) → L'_2
  37. Rotate(L', If[6 < a < 7, ((a - 6) * π / 2), π / 2], L) → L''
  38. Segment(L'_2, L'') → k'
  39. Rotate(K'_1, If[6 < a < 7, ((a - 6) * π / 2), π / 2], L) → O
  40. Rotate(K'', If[6 < a < 7, ((a - 6) * π / 2), π / 2], L) → K'''_1
  41. Segment(O, K'''_1) → l''_1
  42. Rotate(N, If[6 < a < 7, ((a - 6) * π / 2), π / 2], L) → N'
  43. Rotate(K''', If[6 < a < 7, ((a - 6) * π / 2), π / 2], L) → P
  44. Segment(N', P) → l'''
  45. Rotate(L'_1, If[7 < a < 8, ((a - 7) * π / 2), π / 2], L) → Q
  46. Rotate(K'_2, If[7 < a < 8, ((a - 7) * π / 2), π / 2], L) → R
  47. Rotate(E'_3, If[7 < a < 8, ((a - 7) * π / 2), π / 2], L) → S
  48. Polygon(Q, R, S) → poly1'', s, q, r
  49. Rotate(K'_3, If[7 < a < 8, ((a - 7) * π / 2), π / 2], L) → T
  50. Rotate(K''_1, If[7 < a < 8, ((a - 7) * π / 2), π / 2], L) → U
  51. Segment(T, U) → p
  52. Rotate(L'_2, If[7 < a < 8, ((a - 7) * π / 2), π / 2], L) → V
  53. Rotate(L'', If[7 < a < 8, ((a - 7) * π / 2), π / 2], L) → L'''
  54. Segment(V, L''') → k''
  55. Rotate(O, If[7 < a < 8, ((a - 7) * π / 2), π / 2], L) → O'
  56. Rotate(K'''_1, If[7 < a < 8, ((a - 7) * π / 2), π / 2], L) → W
  57. Segment(O', W) → t
  58. Rotate(N', If[7 < a < 8, ((a - 7) * π / 2), π / 2], L) → N''
  59. Rotate(P, If[7 < a < 8, ((a - 7) * π / 2), π / 2], L) → P'
  60. Segment(N'', P') → b
  61. Rotate(Q, If[8 < a < 9, ((a - 8) * π / 2), π / 2], L) → Q'
  62. Rotate(R, If[8 < a < 9, ((a - 8) * π / 2), π / 2], L) → R'
  63. Rotate(S, If[8 < a < 9, ((a - 8) * π / 2), π / 2], L) → S'
  64. Polygon(Q', R', S') → poly1''', s', q', r'
  65. Rotate(V, If[8 < a < 9, ((a - 8) * π / 2), π / 2], L) → V'
  66. Rotate(L''', If[8 < a < 9, ((a - 8) * π / 2), π / 2], L) → Z
  67. Segment(V', Z) → k'''
  68. Rotate(N'', If[8 < a < 9, ((a - 8) * π / 2), π / 2], L) → N'''
  69. Rotate(P', If[8 < a < 9, ((a - 8) * π / 2), π / 2], L) → P''
  70. Segment(N''', P'') → b'
  71. Rotate(O', If[8 < a < 9, ((a - 8) * π / 2), π / 2], L) → O''
  72. Rotate(W, If[8 < a < 9, ((a - 8) * π / 2), π / 2], L) → W'
  73. Segment(O'', W') → t'
  74. Rotate(T, If[8 < a < 9, ((a - 8) * π / 2), π / 2], L) → T'
  75. Rotate(U, If[8 < a < 9, ((a - 8) * π / 2), π / 2], L) → U'
  76. Segment(T', U') → p'
  77. Intersect(d, f) → A_1
  78. Dilate(A_1, If[9 < a ≤ 10, 10 - a, 0], G) → B_1
  79. Segment(A_1, B_1) → f_1
  80. Rotate(K'_3, If[10 < a < 11, ((a - 10) * π), π], A_1) → C_1
  81. Rotate(K''_1, If[10 < a < 11, ((a - 10) * π), π], A_1) → D_1
  82. Segment(C_1, D_1) → g_1
  83. Rotate(K'_1, If[11 < a < 12, ((a - 11) * π / 6), π / 6], L) → E_1
  84. Rotate(K'', If[11 < a < 12, ((a - 11) * π / 6), π / 6], L) → K'''_2
  85. Segment(E_1, K'''_2) → l''_2
  86. Rotate(M, If[11 < a < 12, ((a - 11) * π / 6), π / 6], L) → M'_1
  87. Rotate(N, If[11 < a < 12, ((a - 11) * π / 6), π / 6], L) → N'_1
  88. Rotate(K''', If[11 < a < 12, ((a - 11) * π / 6), π / 6], L) → F_1
  89. Segment(N'_1, F_1) → l'''_1
  90. Rotate(A_1, π / 2) → G_1
  91. Rotate(G_1, π / 2) → H_1
  92. Dilate(G_1, If[9 < a ≤ 10, 10 - a, 0], E'_1) → I_1
  93. Dilate(H_1, If[9 < a ≤ 10, 10 - a, 0], G'') → J_1
  94. Dilate(K, If[9 < a ≤ 10, 10 - a, 0], E') → K'_4
  95. Segment(G_1, I_1) → h_1
  96. Segment(H_1, J_1) → i_1
  97. Segment(K, K'_4) → j_1
  98. Rotate(C_1, π / 2, L) → K_1
  99. Rotate(D_1, π / 2, L) → L_1
  100. Segment(K_1, L_1) → m_1
  101. Rotate(C_1, π, L) → M_1
  102. Rotate(D_1, π, L) → N_1
  103. Segment(M_1, N_1) → n_1
  104. Rotate(C_1, (3 * π / 2), L) → O_1
  105. Rotate(D_1, (3 * π / 2), L) → P_1
  106. Segment(O_1, P_1) → p_1
  107. Polygon(L, G, A_1) → poly2, a_1, l_2, g_2
  108. Polygon(L, E'_1, G_1) → poly3, g_3, l_3, e'_1
  109. Polygon(L, G'', H_1) → poly4, h_2, l_4, g''
  110. Polygon(L, K, E') → poly5, e', l_5, k_2
  111. Rotate(M'_1, π, L) → Q_1
  112. Rotate(M'_1, π / 2, L) → R_1
  113. Rotate(M'_1, (3 * π / 2), L) → S_1
  114. Rotate(E_1, π / 2, L) → T_1
  115. Rotate(K'''_2, π / 2, L) → U_1
  116. Segment(T_1, U_1) → q_1
  117. Rotate(E_1, π, L) → V_1
  118. Rotate(K'''_2, π, L) → W_1
  119. Segment(V_1, W_1) → r_1
  120. Rotate(E_1, (3 * π / 2), L) → Z_1
  121. Rotate(K'''_2, (3 * π / 2), L) → A_2
  122. Segment(Z_1, A_2) → s_1
  123. Rotate(N'_1, π / 2, L) → B_2
  124. Rotate(F_1, π / 2, L) → C_2
  125. Segment(B_2, C_2) → t_1
  126. Rotate(N'_1, π, L) → D_2
  127. Rotate(F_1, π, L) → E_2
  128. Segment(D_2, E_2) → b_1
  129. Rotate(N'_1, (3 * π / 2), L) → F_2
  130. Rotate(F_1, (3 * π / 2), L) → G_2
  131. Segment(F_2, G_2) → c_1
  132. Circle(L, (0, 0.5)) → d_1
  133. Intersect(d_1, x = 0) → H_2, I_2
  134. Line(G, L) → e_1
  135. Intersect(d_1, e_1) → J_2, K_2
  136. CircleSector(L, J_2, H_2) → c_2
  137. Rotate(c_2, If[13.5 < a ≤ 14.5, ((-(a - 13.5)) * π / 6), ((-π)) / 6], L) → d_2
  138. Rotate(d_2, If[15.5 < a ≤ 16.5, ((-(a - 15.5)) * π / 6), ((-π)) / 6], L) → e_2
  139. Segment(L', A) → f_2
  140. Segment(L'', B) → i_2
  141. Segment(L''', C) → j_2
  142. Segment(Z, D) → m_2