棱锥体积的 GeoGebra 动态探究

棱锥体积的 GeoGebra 动态探究
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2015-08-13 19:45
本范例演示用 GeoGebra 构造并探究棱锥体积的几何模型,通过底面多边形、顶点、高与斜边等对象展示体积公式 V=1/3Sh 的形成过程。核心概念包括棱锥、底面积、高、体积公式、三角函数求高或斜边、多边形与空间几何关系。作图要点:使用 Point 创建顶点与辅助点,Segment 连接棱与高,Polygon 构造底面或截面,Midpoint 获取中点辅助定位,Rotate 生成旋转后的对应点 E′、F′、E″、F″ 等,并配合对象 A、B、C、D、E、F、G、H、I、J、K、L、M、N 及 a_1、d_1、e_1 等标注,形成可交互的棱锥体积演示。适合初中至高中立体几何、数学实验课或教师备课演示。

GeoGebra 命令及参数

  1. Point(Circle[A, r]) → B
  2. Point(Circle[A, r]) → C
  3. Point(Circle[C, r]) → D
  4. Point(Circle[B, (2 * r)]) → E
  5. Segment(B, E) → e
  6. Point(Circle[D, (2 * r)]) → F
  7. Segment(D, F) → f
  8. Rotate(E, α, B) → E'
  9. Rotate(F, α, D) → F'
  10. Segment(B, E') → g
  11. Segment(D, F') → h
  12. Point(g) → G
  13. Point(h) → H
  14. Rotate(E', α / 2, G) → E''
  15. Rotate(F', α / 2, H) → F''
  16. Point(Circle[C, r]) → I
  17. Segment(C, I) → p
  18. Point(Circle[D, r]) → J
  19. Segment(D, J) → q
  20. Rotate(C, α / 2, C) → C'
  21. Rotate(I, α / 2, C) → I'
  22. Rotate(D, α / 2, D) → D'
  23. Rotate(J, α / 2, D) → J'
  24. Point(Circle[A, r]) → K
  25. Segment(A, K) → t
  26. Point(Circle[B, r]) → L
  27. Segment(B, L) → a_1
  28. Rotate(B, (-α), B) → B'
  29. Rotate(L, (-α), B) → L'
  30. Rotate(A, (-α), A) → A'
  31. Rotate(K, (-α), A) → K'
  32. Point(Circle[A, r]) → M
  33. Segment(A, M) → d_1
  34. Point(Circle[C, r]) → N
  35. Segment(C, N) → e_1
  36. Rotate(A, (-(α / 2)), A) → A'_1
  37. Rotate(M, (-(α / 2)), A) → M'
  38. Rotate(C, (-(α / 2)), C) → C'_1
  39. Rotate(N, (-(α / 2)), C) → N'
  40. Midpoint(H, E'') → O
  41. Midpoint(D, G) → P
  42. Midpoint(C, B) → Q
  43. Midpoint(A, L') → R
  44. Midpoint(N', A) → S
  45. Midpoint(I', D) → T
  46. Point(Circle[P, r / 2]) → U
  47. Segment(P, U) → i_1
  48. Rotate(U, α / 2, P) → U'
  49. Point(Circle[O, r / 2]) → V
  50. Segment(O, V) → n_1
  51. Rotate(V, α / 2, H) → V'
  52. Point(Circle[T, r / 2]) → W
  53. Segment(T, W) → t_1
  54. Point(Circle[Q, r / 2]) → Z
  55. Segment(Q, Z) → a_2
  56. Point(Circle[R, r / 2]) → A_1
  57. Segment(R, A_1) → b_2
  58. Point(Circle[S, r / 2]) → B_1
  59. Segment(S, B_1) → c_2
  60. Rotate(A_1, (-(α / 2)), R) → C_1
  61. Rotate(B_1, (-α), S) → D_1
  62. Rotate(W, α, T) → W'
  63. Polygon(Z, E_1, B) → poly3, b_1, z, e_2
  64. Polygon(Z, D, B) → poly4, b_3, z_1, d
  65. Polygon(E_1, K', L', B) → poly1, e_3, k', l', b
  66. Polygon(C_1, L', B) → poly2, b_4, c_1, l'_1
  67. Polygon(K', L', C_1) → poly5, c_3, k'_1, l'_2
  68. Polygon(D, B, G, H) → poly6, d_2, b_5, g_1, h_1
  69. Polygon(U', B, G) → poly7, g_2, u', b_6
  70. Polygon(U', H, G) → poly8, g_3, u'_1, h_2
  71. Polygon(H, F'', E'', G) → poly9, h_3, f'', e'', g_4
  72. Polygon(V', E'', F'') → poly10, f''_1, v', e''_1
  73. Polygon(V', G, E'') → poly11, e''_2, v'_1, g_5
  74. Polygon(W', D, J') → poly12, j', w', d_3
  75. Polygon(C, W', D) → poly13, d_4, c, w'_1
  76. Polygon(J', I', W') → poly14, w'_2, j'_1, i'
  77. Polygon(D_1, E_1, Z) → poly15, z_2, d_5, e_4
  78. Polygon(D_1, N', M') → poly16, m', d_6, n'
  79. Polygon(M', E_1, D_1) → poly17, d_7, m'_1, e_5
  80. Polygon(F_1, G_1, H_1, I_1) → poly18, f_1, g_6, h_4, i_2
  81. Polygon(J_1, K_1, L_1, M_1) → poly19, j_1, k_1, l_1, m_1
  82. Polygon(N_1, O_1, P_1, Q_1) → poly20, n_2, o_1, p_1, q_1

AI 绘图提示语参考

画一个动态金字塔体积模型,展示底面多边形、顶点、高度和斜边如何关联体积公式 V=1/3Sh。首先构建底面多边形和顶点,然后画出高度和斜边。通过旋转和辅助点生成侧面,并标注关键点如 G、H、E''、F''。最后,计算中点 O、P、Q、R、S、T,并画出辅助圆和线段,完整呈现几何关系和体积计算过程。
以上提示语为根据原始绘图命令整理而来,仅供参考。