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梯形性质探究 by norazlin

梯形性质探究 by norazlin
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2018-07-03 20:07
多边形角几何作图滑块动画
①本范例通过交互式演示梯形的性质；②涉及核心数学概念包括多边形、角度、几何变换；③构造时用到了Point, Ray, Polygon, Segment, Intersect, Angle等GeoGebra命令和对象；④适合初中及以上学生用于学习和理解梯形几何特性。

GeoGebra 命令及参数

  1. Point(a) → A
  2. Point(a) → Z
  3. Ray(A, Z) → b
  4. Point(b) → D
  5. Point(c) → Y
  6. Ray(B, Y) → d
  7. Point(d) → C
  8. Polygon(A, B, C, D) → poly1, a_1, b_1, c_1, d_1
  9. Segment(B, D) → e
  10. Segment(C, A) → f
  11. Intersect(e, f) → X
  12. Segment(A, X) → g
  13. Segment(X, C) → j
  14. Segment(X, B) → k
  15. Segment(X, D) → l
  16. Angle(A, X, D) → α
  17. Angle(A, B, C) → β
  18. Angle(B, C, D) → γ
  19. Angle(C, D, A) → δ
  20. Angle(D, A, B) → ε
  21. Angle(X, B, C) → ζ
  22. Angle(B, C, X) → η
  23. Angle(X, C, D) → θ
  24. Angle(C, D, X) → ι
  25. Angle(X, D, A) → κ
  26. Angle(D, A, X) → λ
  27. Angle(X, A, B) → μ
  28. Angle(A, B, X) → ν