积极 AI Logo 积极 AI

平行四边形面积探索

平行四边形面积探索
几何画板及绘图内容加载中，请稍等……
2020-03-28 02:26
多边形角变换
这个动态示例展示了平行四边形的面积等于具有相同底和高的矩形的面积。核心数学概念包括平行四边形、矩形和相似变换。通过使用GeoGebra命令如Line、Segment、Polygon和Dilate等，可以直观地理解面积等价关系。适合初中及以上学生学习几何变换和面积计算。

GeoGebra 命令及参数

  1. Line(A, B) → f_1
  2. Line(A, B) → b
  3. Slope(b) → m
  4. PointIn(d) → C
  5. Segment(A, B) → a
  6. Line(C, a) → f
  7. OrthogonalLine(B, f) → n
  8. Intersect(f, n) → H
  9. Segment(C, H) → l
  10. Point(l) → I
  11. OrthogonalLine(I, l) → q
  12. Intersect(q, a) → J
  13. Circle(B, Distance[A, J]) → g_1
  14. Intersect(g_1, f_1, 2) → M
  15. Segment(A, C) → e
  16. Point(f) → D
  17. Ray(C, D) → g
  18. Line(B, e) → h
  19. Intersect(h, g) → E
  20. Segment(C, E) → i
  21. Segment(B, E) → j
  22. Point(i) → F
  23. OrthogonalLine(A, i) → k
  24. Angle(B, A, C) → α
  25. Ray(C, E) → p
  26. Intersect(f, k) → G
  27. Segment(G, E) → r
  28. Point(r) → K
  29. OrthogonalLine(K, r) → s
  30. Intersect(s, a) → L
  31. Polygon(A, J, I, C) → poly1, a_1, j_1, i_1, c_1
  32. Polygon(J, B, E, I) → poly2, j_2, b_1, e_1, i_2
  33. Polygon(A, L, K, C) → poly3, a_2, l_1, k_1, c_2
  34. Polygon(L, B, E, K) → poly4, l_2, b_2, e_2, k_2
  35. Dilate(I, If[0 < o ≤ 1, 1 - o, 0], J) → I'
  36. Segment(I, I') → t
  37. Angle(J, I, E) → β
  38. Dilate(J, If[2 < o ≤ 3, 3 - o, 0], M) → J'
  39. Vector(J, J') → u
  40. Angle(B, J, I) → γ
  41. OrthogonalLine(E, b) → d_1
  42. Translate(A, u) → A'
  43. Translate(J, u) → J'_1
  44. Translate(I, u) → I'_1
  45. Translate(C, u) → C'
  46. Polygon(A', J'_1, I'_1, C') → poly1', a', j'_1, i'_1, c'
  47. Angle(I'_1, J', J) → δ
  48. Polygon(A, B, E, C) → poly5, a_3, b_3, e_3, c_3
  49. Circle(E, Distance[C, K]) → h_1
  50. Intersect(h_1, f, 2) → N
  51. Polygon(A, B, E, C) → poly6, a_4, b_4, e_4, c_4
  52. Dilate(K, If[0 < o ≤ 1, 1 - o, 0], L) → K'
  53. Segment(K, K') → m_1
  54. Angle(L, K, E) → ε
  55. Angle(B, L, K) → ζ
  56. Dilate(K, If[2 < o ≤ 3, 3 - o, 0], N) → K'_1
  57. Vector(K, K'_1) → v
  58. Translate(A, v) → A'_1
  59. Translate(L, v) → L'
  60. Translate(K, v) → K'_2
  61. Translate(C, v) → C'_1
  62. Polygon(A'_1, L', K'_2, C'_1) → poly3', a'_1, l', k'_2, c'_1
  63. Angle(K'_1, L', A) → η
  64. Segment(J'_1, I'_1) → n_1
  65. Segment(L', K'_2) → p_1