抛物线演示 by ganesh

抛物线演示 by ganesh
几何画板及绘图内容加载中,请稍等……
2016-11-09 12:38
①本范例演示抛物线的定义及其几何性质;②涉及核心数学概念包括抛物线、线性方程、坐标系、向量等;③作图要点:使用Point, Parabola, Segment, Distance, OrthogonalLine, Intersect, Ray, Vector等GeoGebra命令构建抛物线焦点、准线及动态点;④适合高中解析几何教学和数学兴趣探索。

GeoGebra 命令及参数

  1. Point(pointA) → F
  2. Parabola(F, b) → c
  3. Point(c) → P1
  4. Segment(P1, F) → d
  5. Distance(P1, F) → distanceBA
  6. OrthogonalLine(P1, b) → e
  7. Intersect(b, e) → B1
  8. Segment(B1, P1) → f
  9. Distance(B1, P1) → distanceCB
  10. Point(xAxis) → A
  11. Point(xAxis) → B
  12. Ray(A, B) → j
  13. Segment(B, A) → k
  14. Segment(B, A) → l
  15. Vector(C, D) → u
  16. Vector(C_1, D_1) → u_1
  17. Vector(C_2, D_2) → u_2
  18. Vector(C_3, D_3) → u_3