圆柱体尺寸变化演示

圆柱体尺寸变化演示
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2017-04-28 08:54
①本范例演示圆柱体在不同底面半径和高变化时的形态与尺寸;②涉及核心数学概念包括圆柱体体积公式V=πr²h、表面积公式A=2πrh+2πr²;③作图要点运用了Line, Point, Ellipse, Vector, Translate, Intersect, Segment, PointIn, Midpoint, Circumference等GeoGebra命令与对象构建圆柱体及动态元素;④适合高中立体几何教学,用于直观理解体积与表面积计算及参数影响。

GeoGebra 命令及参数

  1. Line(A, B) → a
  2. Line(A, C) → b
  3. Point(b) → D
  4. Ellipse(A, D, E) → c
  5. Point(a) → F
  6. Vector(A, F) → u
  7. Translate(c, u) → c'
  8. Line(F, b) → d
  9. Intersect(c', d, 1) → G
  10. Intersect(c, b, 1) → H
  11. Intersect(c', d, 2) → I
  12. Intersect(c, b, 2) → J
  13. Segment(H, G) → e
  14. Segment(I, J) → f
  15. PointIn(c') → Pointc'
  16. Intersect(c, e, 1) → K
  17. Segment(K, D) → h
  18. Midpoint(h) → L
  19. Point(c) → M
  20. Intersect(c, e, 1) → P
  21. Intersect(c, f, 1) → N
  22. Segment(P, N) → i
  23. Midpoint(i) → O
  24. Vector(O, P) → v
  25. Circumference(c) → circumferencec
  26. PointIn(c) → Pointc_1
  27. PointIn(c) → Pointc
  28. Segment(O, P) → k