动态几何问题示例：圆与线段

GeoGebra 命令及参数

1. Point(yAxis) → B
2. Circle(A, B) → c
3. Segment(A, B) → f
4. Point(c) → C
5. Line(C, A) → g
6. Intersect(c, g, 2) → D
7. Semicircle(D, C) → d
8. Point(d) → E
9. CircleArc(A, C, E) → e
10. Point(e) → F
11. Segment(F, D) → h
12. Segment(E, C) → i
13. Intersect(h, i) → G
14. Tangent(F, c) → j,
15. Tangent(E, c) → k,
16. LineBisector(E, G) → l
17. Line(E, A) → m
18. Intersect(m, l) → H
19. Circle(H, E) → p
20. Line(F, A) → n
21. LineBisector(G, F) → q
22. Intersect(n, q) → I
23. Circle(I, F) → r
24. Dilate(F, If[0 < a ≤ 1, 1 - a, 0], G) → F'
25. Segment(F, F') → s
26. Dilate(G, If[1 < a ≤ 2, 2 - a, 0], D) → G'
27. Segment(G, G') → t
28. Dilate(E, If[2 < a ≤ 3, 3 - a, 0], G) → E'
29. Segment(E, E') → b
30. Dilate(G, If[3 < a ≤ 4, 4 - a, 0], C) → G'_1
31. Segment(G, G'_1) → f_1
32. Dilate(D, If[6 < a ≤ 7, 7 - a, 0], A) → D'
33. Segment(D, D') → g_1
34. Dilate(A, If[7 < a ≤ 8, 8 - a, 0], C) → A'
35. Segment(A, A') → h_1