焦点与准线定义的抛物线

焦点与准线定义的抛物线
几何画板及绘图内容加载中,请稍等……
2015-11-13 23:36
本范例演示如何通过焦点和准线构造抛物线。核心数学概念包括抛物线的定义、几何作图和解析几何。使用了Line, Parabola, OrthogonalLine, Intersect, Point, Segment等GeoGebra命令。适合高中数学教学和学习。

GeoGebra 命令及参数

  1. Line(A, B) → directrix
  2. Parabola(focus, directrix) → parabola
  3. OrthogonalLine(focus, directrix) → b
  4. Intersect(directrix, b) → D
  5. Intersect(parabola, b, 1) → vertex
  6. Point(parabola) → G
  7. Point(parabola) → H
  8. Point(parabola) → I
  9. Point(parabola) → J
  10. Point(parabola) → K
  11. OrthogonalLine(K, directrix) → d
  12. OrthogonalLine(J, directrix) → e
  13. OrthogonalLine(G, directrix) → g
  14. OrthogonalLine(H, directrix) → h
  15. OrthogonalLine(I, directrix) → i
  16. Intersect(directrix, d) → L
  17. Intersect(directrix, e) → M
  18. Intersect(directrix, g) → O
  19. Intersect(directrix, h) → P
  20. Intersect(directrix, i) → Q
  21. Segment(focus, J) → j
  22. Segment(J, M) → k
  23. Segment(focus, K) → l
  24. Segment(K, L) → m
  25. Segment(focus, G) → q
  26. Segment(G, O) → r
  27. Segment(H, focus) → s
  28. Segment(H, P) → t
  29. Segment(focus, I) → a_1
  30. Segment(I, Q) → b_1