垂直平分线定义交互式写作提示（SA.9）

GeoGebra 命令及参数

1. Segment(A, B) → f
2. Midpoint(f) → C
3. LineBisector(f) → p
4. Circle(C, (0.1 * f)) → c
5. Intersect(c, f, 2) → D
6. Intersect(c, p, 2) → E
7. CircleSector(C, D, E) → d
8. Dilate(A, If[0 < a ≤ 1, 1 - a, 0], C) → A'
9. Segment(A, A') → h
10. Dilate(C, If[1 < a ≤ 2, 2 - a, 0], B) → C'
11. Segment(C, C') → i
12. Rotate(A, If[2 < a ≤ 3, ((-(a - 2)) * π), (-π)], C) → A'_1
13. Rotate(A', If[2 < a ≤ 3, ((a - 2) * π), π], C) → A''
14. Segment(A'_1, A'') → h'
15. Rotate(d, If[3 < a ≤ 4, ((a - 3) * π / 2), π / 2], C) → d'