测量角度

测量角度
几何画板及绘图内容加载中,请稍等……
2015-09-28 20:15
①本范例演示了使用 GeoGebra 测量角度的方法;②涉及的核心数学概念包括角度、距离、旋转和圆;③作图要点——从下方『构造摘要』提炼用到了 Angle, Distance, Circle, Point, Rotate, Ray, Intersect, CircleSector 等命令/对象;④适合初中及以上学生学习和理解几何角度测量方法。

GeoGebra 命令及参数

  1. Angle(C_1, A_1, B_1) → α
  2. Distance(A_1, B_1) → distanceAB
  3. Circle(A_1, a) → c
  4. Point(c) → D
  5. Rotate(D, 195.58*°, A_1) → D'
  6. Angle(D', A_1, D) → β
  7. Ray(B, A) → d
  8. Ray(B, C) → e
  9. Circle(B, 1.5) → f
  10. Intersect(f, d) → E,
  11. Intersect(f, e, 1) → F
  12. CircleSector(B, E, F) → g
  13. Ray(G, H) → i
  14. Ray(G, I) → j
  15. Circle(G, 1.5) → k
  16. Intersect(k, j, 1) → J
  17. Intersect(k, i, 1) → K
  18. CircleSector(G, J, K) → p
  19. Ray(L, M) → m
  20. Ray(L, N) → n
  21. Circle(L, 1.5) → q
  22. Intersect(q, m, 1) → O
  23. Intersect(q, n, 1) → P
  24. CircleSector(L, O, P) → r
  25. Ray(Q, R) → s
  26. Ray(Q, S) → t
  27. Circle(Q, 1.5) → c_1
  28. Intersect(c_1, s, 1) → T
  29. Intersect(c_1, t, 1) → U
  30. CircleSector(Q, U, T) → d_1
  31. Ray(V, W) → a_1
  32. Ray(V, Z) → b_1
  33. Circle(V, 1.5) → e_1
  34. Intersect(e_1, a_1) → D_1,
  35. Intersect(e_1, b_1, 1) → E_1
  36. CircleSector(V, E_1, D_1) → f_1