球体体积公式证明 by sjlg.sgs1

球体体积公式证明 by sjlg.sgs1
几何画板及绘图内容加载中,请稍等……
2015-05-29 08:59
①本范例通过动态演示和几何构造,直观展示球体体积公式的推导过程;②涉及核心数学概念包括球体、体积、相似变换、几何作图、正交线等;③构造过程中运用了Intersect(交点)、Point(点)、Circle(圆)、Distance(距离)、Sphere(球体)、Cylinder(圆柱)、OrthogonalLine(正交线)、Segment(线段)、IntersectPath(路径交点)、Surface(曲面)、Polygon(多边形)、If(条件)等GeoGebra命令和对象;④适合高中立体几何教学,帮助学生理解体积公式的几何意义和推导逻辑。

GeoGebra 命令及参数

  1. Intersect(xAxis, yAxis) → A
  2. Point(xAxis) → B
  3. Circle(A, B) → c
  4. Distance(A, B) → r
  5. Point(xAxis) → D
  6. Circle(D, r) → h
  7. Sphere(A, r) → a
  8. Cylinder(h, r) → b, d, e
  9. Cylinder(h, (-r)) → f, g, i
  10. Point(xAxis) → C
  11. OrthogonalLine(C, xOyPlane) → j
  12. Segment(E, C) → k
  13. Point(k) → G
  14. IntersectPath(l, a) → p
  15. IntersectPath(l, b) → q
  16. Surface((u * cos(θ)) + Distance[A, D], (u * sin(θ)), u, θ, 0, 6.283185307179586, u, (-r), r) → m
  17. IntersectPath(l, f) → s
  18. OrthogonalLine(D, l) → n
  19. Surface(x(H) + (u * cos(θ)), (u * sin(θ)), z(G), u, z(G), r, θ, 0, 6.283185307179586) → o
  20. Segment(A, B) → t
  21. Intersect(h, xAxis, 2) → J
  22. Segment(D, J) → a_1
  23. Segment(A, I) → b_1
  24. Segment(D, H) → c_1
  25. Intersect(u, p) → K, L
  26. Segment(I, L) → d_1
  27. Segment(A, L) → e_1
  28. Segment(H, N) → f_1
  29. Segment(C, G) → g_1
  30. Segment(A, L) → h_1
  31. Polygon(A, I, L) → poly1, l_1, a_2, i_1
  32. Segment(S, R) → j_1
  33. Polygon(S, R, D) → poly2, d_2, s_1, r_1
  34. Segment(D, S) → k_1
  35. If(Step ≠ 10, Step ≟ Step + 1, Step ≟ 0) → v
  36. If(Step ≠ 10, Step ≟ Step + 1, Step ≟ 0) → w
  37. If(Step ≠ 10, Step ≟ Step + 1, Step ≟ 0) → m_1
  38. If(Step ≠ 10, Step ≟ Step + 1, Step ≟ 0) → n_1
  39. If(Step ≠ 10, Step ≟ Step + 1, Step ≟ 0) → o_1
  40. If(Step ≠ 10, Step ≟ Step + 1, Step ≟ 0) → p_1