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梯形拖拽演示

梯形拖拽演示
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2017-05-20 01:37
多边形解析几何
①本范例通过拖拽演示梯形及其相关属性的变化；②涉及核心数学概念包括多边形、解析几何、几何作图；③构造时用到了Join, Point, Line, Ray, Polygon, Segment, Intersect, Distance, Midpoint等GeoGebra命令；④适合高中数学教学，用于理解梯形性质及动态几何关系。

GeoGebra 命令及参数

  1. Join(Sequence[Sequence[(i, j), i, -7.3, 7.8, 0.1], j, -4, 2.6, 0.1]) → GridSpace
  2. Point(GridSpace) → B
  3. Point(GridSpace) → A
  4. Line(A, B) → ABline
  5. Point(GridSpace) → D
  6. Line(D, ABline) → CDline
  7. Point(CDline) → E
  8. Ray(D, E) → DEray
  9. Point(DEray) → C
  10. Polygon(A, B, C, D) → Trapezoid, f, g, h, i
  11. Segment(D, B) → DB
  12. Segment(A, C) → AC
  13. Intersect(AC, DB) → O
  14. Distance(D, O) → DOlength
  15. Distance(A, O) → AOlength
  16. Distance(B, O) → BOlength
  17. Distance(C, O) → COlength
  18. Midpoint(A, O) → AOpoint
  19. Midpoint(B, O) → BOpoint
  20. Midpoint(D, O) → DOpoint
  21. Midpoint(C, O) → COpoint
  22. Segment(D, C) → DC