弦的性质

弦的性质
几何画板及绘图内容加载中,请稍等……
2017-12-22 21:50
所属专题 Mathematics Form 2
①本范例演示圆中弦的性质,包括弦与圆心、弦心距、圆周角的关系;②涉及核心数学概念有圆、相似三角形、圆周角定理、弦心距公式;③作图要点提炼自构造摘要,使用了Circle(圆)、Point(点)、Segment(线段)、Intersect(交点)、OrthogonalLine(垂线)、Angle(角度)、If(条件判断)、CircleArc(圆弧)、Line(直线)、Semicircle(半圆)、Rotate(旋转)、DynamicCoordinates(动态坐标)、Distance(距离)、Length(长度)、LineBisector(角平分线)等GeoGebra命令/对象;④适合高中阶段学习圆的性质、几何作图及动态几何演示的师生使用。

GeoGebra 命令及参数

  1. SelectedIndex(Bahasa) → nn
  2. Circle(O, Rd) → c
  3. Point(c) → D
  4. Point(c) → B
  5. Point(c) → A
  6. Segment(A, B) → g
  7. Circle(D, g) → e
  8. Intersect(c, e, 1) → J
  9. Segment(D, J) → n
  10. OrthogonalLine(O, n) → q
  11. Intersect(q, n) → L
  12. OrthogonalLine(O, g) → i
  13. Intersect(i, g) → K
  14. Angle(K, O, L) → γ
  15. Angle(A, O, B) → α
  16. If(α ≤ 180°, A, B) → M
  17. If(α ≤ 180°, B, A) → N
  18. If(γ > 180°, Rotate[N, ((-a) * (360° - γ)), O], Rotate[N, (a * γ), O]) → S
  19. If(γ > 180°, Rotate[M, ((-a) * (360° - γ)), O], Rotate[M, (a * γ), O]) → R
  20. CircleArc(O, M, N) → Arc1
  21. Point(Arc1) → G
  22. Intersect(Arc1, i) → F, E_1
  23. Line(O, A) → f
  24. Intersect(c, f, 2) → P
  25. Semicircle(A, P) → d
  26. Rotate(d, ((a * 180))°, O) → d'
  27. If(Distance[G, F] < 0.2, F, G) → T
  28. If(nn ≟ 1, {"Properties of diameter", "Properties of chord 1", "Properties of chord 2", "Properties of chord 3", "Properties of chord 4"}, {"Sifat diameter", "Sifat perentas 1", "Sifat perentas 2", "Sifat perentas 3", "Sifat perentas 4"}) → Sifat
  29. SelectedIndex(Sifat) → m
  30. DynamicCoordinates(G, x(T), y(T)) → C
  31. Line(C, O) → h
  32. Intersect(h, g) → E
  33. If(α > 180°, Rotate[B, (((-a) * 180))°, E], Rotate[B, ((a * 180))°, E]) → B'
  34. Segment(E, B') → j
  35. Angle(A, E, O) → β
  36. CircleArc(O, R, S) → p
  37. Segment(C, O) → l
  38. If(γ > 180°, Rotate[K, ((-u) * (360° - γ)), O], Rotate[K, (u * γ), O]) → W
  39. Segment(O, W) → t
  40. Segment(R, S) → f_1
  41. Angle(O, K, B) → ε
  42. Angle(O, L, D) → ζ
  43. If(γ > 180°, Rotate[M, (-(360° - γ)), O], Rotate[M, γ, O]) → U
  44. If(γ > 180°, Rotate[N, (-(360° - γ)), O], Rotate[N, γ, O]) → V
  45. CircleArc(O, U, V) → Arc2
  46. Distance(R, S) → RS
  47. Length(p) → PL
  48. Distance(O, W) → OW
  49. Point(c) → Z
  50. Segment(D, Z) → b
  51. LineBisector(D, Z) → g_1
  52. LineBisector(B, A) → h_1
  53. Intersect(g_1, b) → A_1
  54. Intersect(h_1, g) → B_1
  55. Angle(O, A_1, D) → η
  56. Angle(O, B_1, A) → θ
  57. Segment(A, P) → k